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### [Is there a way to find the most valuable path that's less than or equal to length L in a given graph without bruteforcing a Depth First Search?](/questions/5047428/is-there-a-way-to-find-the-most-valuable-path-thats-less-than-or-equal-to-lengt)
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
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[modified 2 mins ago](/questions/5047428/is-there-a-way-to-find-the-most-valuable-path-thats-less-than-or-equal-to-lengt?lastactivity)
0 votes
1 answer
16 views
### [What do you call a group action that is both a left action and a right action?](/questions/5048124/what-do-you-call-a-group-action-that-is-both-a-left-action-and-a-right-action)
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[Captain Lama](/users/318467/captain-lama)
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[answered 6 mins ago](/questions/5048124/what-do-you-call-a-group-action-that-is-both-a-left-action-and-a-right-action?lastactivity)
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1k views
### [Question about proof for bipartite containing no odd cycles](/questions/1750708/question-about-proof-for-bipartite-containing-no-odd-cycles)
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[modified 8 mins ago](/questions/1750708/question-about-proof-for-bipartite-containing-no-odd-cycles?lastactivity)
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3 views
### [Deriving the density of spherical distribution from its characteristic function](/questions/5048126/deriving-the-density-of-spherical-distribution-from-its-characteristic-function)
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](/users/692201/w-j)
[W.J](/users/692201/w-j)
* 165
[asked 9 mins ago](/questions/5048126/deriving-the-density-of-spherical-distribution-from-its-characteristic-function)
\-3 votes
0 answers
10 views
### [Sum of squares method](/questions/5048125/sum-of-squares-method)
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[asked 9 mins ago](/questions/5048125/sum-of-squares-method)
6 votes
2 answers
163 views
### [Countable extent implies countable spread for Metric Spaces](/questions/5047108/countable-extent-implies-countable-spread-for-metric-spaces)
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](/users/1088067/avyaktha-achar)
[Avyaktha Achar](/users/1088067/avyaktha-achar)
* 567
[modified 12 mins ago](/questions/5047108/countable-extent-implies-countable-spread-for-metric-spaces?lastactivity)
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2 views
### [Continuous Hilbert Matrix Operator on the upper Half-Plane](/questions/5048123/continuous-hilbert-matrix-operator-on-the-upper-half-plane)
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[asked 13 mins ago](/questions/5048123/continuous-hilbert-matrix-operator-on-the-upper-half-plane)
2 votes
2 answers
178 views
### [Reconciling two definitions of domains of holomorphy](/questions/1961774/reconciling-two-definitions-of-domains-of-holomorphy)
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[modified 16 mins ago](/questions/1961774/reconciling-two-definitions-of-domains-of-holomorphy?lastactivity)
0 votes
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9 views
### [A quotient of tensor products with identities](/questions/5048122/a-quotient-of-tensor-products-with-identities)
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[user1936752](/users/99503/user1936752)
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[modified 1 min ago](/questions/5048122/a-quotient-of-tensor-products-with-identities)
\-1 votes
1 answer
37 views
### [limR→∞(R∫π/40e−R2sin(2θ)+pRcos(θ)dθ)](/questions/5048079/lim-r-rightarrow-infty-r-int-0-pi-4-e-r2-sin2-theta-pr-cos-th)
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[geetha290krm](/users/1064504/geetha290krm)
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[modified 23 mins ago](/questions/5048079/lim-r-rightarrow-infty-r-int-0-pi-4-e-r2-sin2-theta-pr-cos-th?lastactivity)
0 votes
0 answers
13 views
### [Equality of objects in categories](/questions/5048120/equality-of-objects-in-categories)
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[Ellen de Oliveira](/users/1573329/ellen-de-oliveira)
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[asked 31 mins ago](/questions/5048120/equality-of-objects-in-categories)
0 votes
1 answer
37 views
### [Reducing a G\-bundle to an H\-bundle](/questions/5042104/reducing-a-g-bundle-to-an-h-bundle)
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* 129
[answered 33 mins ago](/questions/5042104/reducing-a-g-bundle-to-an-h-bundle?lastactivity)
4 votes
4 answers
213 views
### [Evaluate ∞∫01xln(x3−x2−x+1x3+x2+x+1)dx](/questions/5043573/evaluate-int-limits-infty-0-frac1x-ln-left-fracx3-x2)
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[Claude Leibovici](/users/82404/claude-leibovici)
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[answered 36 mins ago](/questions/5043573/evaluate-int-limits-infty-0-frac1x-ln-left-fracx3-x2?lastactivity)
31 votes
4 answers
25k views
### [KKT and Slater's condition](/questions/379543/kkt-and-slaters-condition)
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
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[modified 38 mins ago](/questions/379543/kkt-and-slaters-condition?lastactivity)
\-1 votes
0 answers
9 views
### [law of the excluded middle](/questions/5048116/law-of-the-excluded-middle)
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[provocateur](/users/683716/provocateur)
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[asked 39 mins ago](/questions/5048116/law-of-the-excluded-middle)
2 votes
1 answer
36 views
### [What's the name of this probabilistic model for events with fixed average frequency?](/questions/5047958/whats-the-name-of-this-probabilistic-model-for-events-with-fixed-average-freque)
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[Max](/users/326879/max)
* 452
[answered 39 mins ago](/questions/5047958/whats-the-name-of-this-probabilistic-model-for-events-with-fixed-average-freque?lastactivity)
13 votes
1 answer
3k views
### [Help me organize these concepts — KKT conditions and dual problem](/questions/486400/help-me-organize-these-concepts-kkt-conditions-and-dual-problem)
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
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[modified 41 mins ago](/questions/486400/help-me-organize-these-concepts-kkt-conditions-and-dual-problem?lastactivity)
0 votes
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5 views
### [Counter-example for a polynomial time graph isomorphism algorithm](/questions/5048113/counter-example-for-a-polynomial-time-graph-isomorphism-algorithm)
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[asked 42 mins ago](/questions/5048113/counter-example-for-a-polynomial-time-graph-isomorphism-algorithm)
1 vote
0 answers
7 views
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[Glorfindel](/users/228959/glorfindel)
* 3,975
[modified 43 mins ago](/questions/5048111/regular-expression-for-language-of-all-those-strings-which-contain-at-least-two)
0 votes
0 answers
6 views
### [Extending a partial order on a finite set to a total order](/questions/5048112/extending-a-partial-order-on-a-finite-set-to-a-total-order)
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[Bobby-John Wilson](/users/1525384/bobby-john-wilson)
* 63
[asked 44 mins ago](/questions/5048112/extending-a-partial-order-on-a-finite-set-to-a-total-order)
0 votes
0 answers
4 views
### [If the line l intersects the plane F at one point and forms equal angles with three different lines of F, show that l is perpendicular to F.](/questions/5048110/if-the-line-l-intersects-the-plane-f-at-one-point-and-forms-equal-angles-with-th)
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[RFW](/users/1281559/rfw)
* 15
[asked 45 mins ago](/questions/5048110/if-the-line-l-intersects-the-plane-f-at-one-point-and-forms-equal-angles-with-th)
3 votes
2 answers
650 views
### [Simply put, are most functions in the "real world" non-convex?](/questions/4357945/simply-put-are-most-functions-in-the-real-world-non-convex)
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
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[modified 49 mins ago](/questions/4357945/simply-put-are-most-functions-in-the-real-world-non-convex?lastactivity)
0 votes
1 answer
186 views
### [Understanding the proof of Theorem of Ostrowski](/questions/4468190/understanding-the-proof-of-theorem-of-ostrowski)
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[user1585259](/users/1585259/user1585259)
* 3
[answered 50 mins ago](/questions/4468190/understanding-the-proof-of-theorem-of-ostrowski?lastactivity)
1 vote
0 answers
76 views
+50
### [How to come up with Klee-Minty cubes?](/questions/5045677/how-to-come-up-with-klee-minty-cubes)
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
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[modified 55 mins ago](/questions/5045677/how-to-come-up-with-klee-minty-cubes)
0 votes
0 answers
9 views
### [Dirichlet characters sum on primes in arithmetical progressions](/questions/5048106/dirichlet-characters-sum-on-primes-in-arithmetical-progressions)
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[almost everywhere](/users/1341207/almost-everywhere)
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[asked 55 mins ago](/questions/5048106/dirichlet-characters-sum-on-primes-in-arithmetical-progressions)
0 votes
0 answers
11 views
### [Can we Apply equivlance transformation on set theoretic relation if yes why?](/questions/5048104/can-we-apply-equivlance-transformation-on-set-theoretic-relation-if-yes-why)
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[
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[Mauro ALLEGRANZA](/users/108274/mauro-allegranza)
* 98.2k
[modified 56 mins ago](/questions/5048104/can-we-apply-equivlance-transformation-on-set-theoretic-relation-if-yes-why)
7 votes
2 answers
289 views
+50
### [Rapidly Converging Series for Particular Values of the Gamma Function](/questions/2348955/rapidly-converging-series-for-particular-values-of-the-gamma-function)
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[MJD](/users/25554/mjd)
* 67.1k
[modified 57 mins ago](/questions/2348955/rapidly-converging-series-for-particular-values-of-the-gamma-function?lastactivity)
0 votes
0 answers
12 views
### [a loop is contractible if and only if the corresponding map?](/questions/5048105/a-loop-is-contractible-if-and-only-if-the-corresponding-map)
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[Brody](/users/1297268/brody)
* 11
[asked 57 mins ago](/questions/5048105/a-loop-is-contractible-if-and-only-if-the-corresponding-map)
0 votes
0 answers
13 views
### [Definition of successive minima](/questions/5047903/definition-of-successive-minima)
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[fade2black](/users/83868/fade2black)
* 249
[modified 59 mins ago](/questions/5047903/definition-of-successive-minima)
0 votes
2 answers
13 views
### [What hapens to an irreducible polynomial after quotient out the ideal generated by another irreducible?](/questions/5048091/what-hapens-to-an-irreducible-polynomial-after-quotient-out-the-ideal-generated)
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[schiepy](/users/1387803/schiepy)
* 647
[answered 1 hour ago](/questions/5048091/what-hapens-to-an-irreducible-polynomial-after-quotient-out-the-ideal-generated?lastactivity)
3 votes
2 answers
996 views
### [Boyd & Vandenberghe, exercise 5.26 — convex QCQP's optimal points, KKT conditions, dual problem](/questions/1544813/boyd-vandenberghe-exercise-5-26-convex-qcqps-optimal-points-kkt-condition)
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
* 22.8k
[modified 1 hour ago](/questions/1544813/boyd-vandenberghe-exercise-5-26-convex-qcqps-optimal-points-kkt-condition?lastactivity)
0 votes
0 answers
22 views
### [Evaluating a nested integral](/questions/5048100/evaluating-a-nested-integral)
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[CP K](/users/1034230/cp-k)
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[asked 1 hour ago](/questions/5048100/evaluating-a-nested-integral)
3 votes
1 answer
2k views
### [Obtain dimension of multivariate polynomial quotient ring?](/questions/1861544/obtain-dimension-of-multivariate-polynomial-quotient-ring)
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[Community](/users/-1/community)Bot
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[modified 1 hour ago](/questions/1861544/obtain-dimension-of-multivariate-polynomial-quotient-ring?lastactivity)
0 votes
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18 views
### [Exponential of a Jacobi field is a geodesic](/questions/5048074/exponential-of-a-jacobi-field-is-a-geodesic)
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[Ѕᴀᴀᴅ](/users/302797/%d0%85%e1%b4%80%e1%b4%80%e1%b4%85)
* 35.3k
[modified 1 hour ago](/questions/5048074/exponential-of-a-jacobi-field-is-a-geodesic)
\-1 votes
0 answers
13 views
### [Expected value of a product of elements of a multinomial](/questions/5048098/expected-value-of-a-product-of-elements-of-a-multinomial)
* [probability](/questions/tagged/probability "show questions tagged 'probability'")
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[
](/users/1594196/lex)
[Lex](/users/1594196/lex)
* 1
[asked 1 hour ago](/questions/5048098/expected-value-of-a-product-of-elements-of-a-multinomial)
1 vote
1 answer
72 views
### [Is the set of monomials a Schauder basis for L2(\[0,1\])?](/questions/5047813/is-the-set-of-monomials-a-schauder-basis-for-l20-1)
* [functional-analysis](/questions/tagged/functional-analysis "show questions tagged 'functional-analysis'")
* [hilbert-spaces](/questions/tagged/hilbert-spaces "show questions tagged 'hilbert-spaces'")
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[
](/users/715896/ryszard-szwarc)
[Ryszard Szwarc](/users/715896/ryszard-szwarc)
* 41.5k
[modified 1 hour ago](/questions/5047813/is-the-set-of-monomials-a-schauder-basis-for-l20-1?lastactivity)
1 vote
0 answers
67 views
+100
### [Convergence of critical point measures of polynomials](/questions/5045670/convergence-of-critical-point-measures-of-polynomials)
* [complex-analysis](/questions/tagged/complex-analysis "show questions tagged 'complex-analysis'")
* [analysis](/questions/tagged/analysis "show questions tagged 'analysis'")
* [measure-theory](/questions/tagged/measure-theory "show questions tagged 'measure-theory'")
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[
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[porridgemathematics](/users/270179/porridgemathematics)
* 1,173
[modified 1 hour ago](/questions/5045670/convergence-of-critical-point-measures-of-polynomials)
0 votes
0 answers
9 views
### [Why the pictorial /intuitive representation of lower semicontinuous function does not match the definition?](/questions/5048089/why-the-pictorial-intuitive-representation-of-lower-semicontinuous-function-doe)
* [real-analysis](/questions/tagged/real-analysis "show questions tagged 'real-analysis'")
* [continuity](/questions/tagged/continuity "show questions tagged 'continuity'")
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[
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[Userhanu](/users/114049/userhanu)
* 609
[modified 1 hour ago](/questions/5048089/why-the-pictorial-intuitive-representation-of-lower-semicontinuous-function-doe)
0 votes
1 answer
18 views
### [Prove that Bt−T and −Bt−T has the same distribution if T is a stopping time](/questions/5047963/prove-that-b-t-t-and-b-t-t-has-the-same-distribution-if-t-is-a-stoppi)
* [probability](/questions/tagged/probability "show questions tagged 'probability'")
* [stochastic-processes](/questions/tagged/stochastic-processes "show questions tagged 'stochastic-processes'")
* [brownian-motion](/questions/tagged/brownian-motion "show questions tagged 'brownian-motion'")
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[
](/users/1564706/jayanth-r-varma)
[Jayanth R Varma](/users/1564706/jayanth-r-varma)
* 1,299
[answered 1 hour ago](/questions/5047963/prove-that-b-t-t-and-b-t-t-has-the-same-distribution-if-t-is-a-stoppi?lastactivity)
1 vote
0 answers
12 views
### [Characterization of substructures using diag(M)](/questions/5048093/characterization-of-substructures-using-diagm)
* [model-theory](/questions/tagged/model-theory "show questions tagged 'model-theory'")
[
](/users/805068/mell-o-tron)
[mell\_o\_tron](/users/805068/mell-o-tron)
* 572
[asked 1 hour ago](/questions/5048093/characterization-of-substructures-using-diagm)
6 votes
1 answer
263 views
### [Finding sum for function with floor-function](/questions/761779/finding-sum-for-function-with-floor-function)
* [summation](/questions/tagged/summation "show questions tagged 'summation'")
* [ceiling-and-floor-functions](/questions/tagged/ceiling-and-floor-functions "show questions tagged 'ceiling-and-floor-functions'")
[
](/users/82404/claude-leibovici)
[Claude Leibovici](/users/82404/claude-leibovici)
* 280k
[answered 1 hour ago](/questions/761779/finding-sum-for-function-with-floor-function?lastactivity)
0 votes
0 answers
9 views
### [How does L1 regularization lead to sparse parameter matrix?](/questions/5048090/how-does-l1-regularization-lead-to-sparse-parameter-matrix)
* [linear-algebra](/questions/tagged/linear-algebra "show questions tagged 'linear-algebra'")
* [optimization](/questions/tagged/optimization "show questions tagged 'optimization'")
* [normed-spaces](/questions/tagged/normed-spaces "show questions tagged 'normed-spaces'")
* [sparse-matrices](/questions/tagged/sparse-matrices "show questions tagged 'sparse-matrices'")
[
](/users/858664/camel)
[camel](/users/858664/camel)
* 164
[asked 1 hour ago](/questions/5048090/how-does-l1-regularization-lead-to-sparse-parameter-matrix)
5 votes
2 answers
144 views
### [Solving the differencial equation ut\=uxx−ux+t2+sinπx](/questions/5042837/solving-the-differencial-equation-u-t-u-xx-u-x-t2-sin-pi-x)
* [partial-differential-equations](/questions/tagged/partial-differential-equations "show questions tagged 'partial-differential-equations'")
[
](/users/1422883/wither-1422883)
[Wither\_1422883](/users/1422883/wither-1422883)
* 349
[modified 1 hour ago](/questions/5042837/solving-the-differencial-equation-u-t-u-xx-u-x-t2-sin-pi-x?lastactivity)
9 votes
2 answers
302 views
### [Topological spaces where every sequence converges](/questions/5047952/topological-spaces-where-every-sequence-converges)
* [general-topology](/questions/tagged/general-topology "show questions tagged 'general-topology'")
[
](/users/1306975/dialegou)
[dialegou](/users/1306975/dialegou)
* 782
[modified 1 hour ago](/questions/5047952/topological-spaces-where-every-sequence-converges?lastactivity)
0 votes
1 answer
35 views
### [Subsequence equal to a pattern](/questions/5047532/subsequence-equal-to-a-pattern)
* [probability](/questions/tagged/probability "show questions tagged 'probability'")
[
](/users/1282870/shubham-vishwakarma)
[SHUBHAM\_VISHWAKARMA](/users/1282870/shubham-vishwakarma)
* 1
[answered 2 hours ago](/questions/5047532/subsequence-equal-to-a-pattern?lastactivity)
3 votes
0 answers
113 views
### [Is a filter of type p contained in an ultrafilter of type p?](/questions/5041944/is-a-filter-of-type-p-contained-in-an-ultrafilter-of-type-p)
* [general-topology](/questions/tagged/general-topology "show questions tagged 'general-topology'")
* [reference-request](/questions/tagged/reference-request "show questions tagged 'reference-request'")
* [set-theory](/questions/tagged/set-theory "show questions tagged 'set-theory'")
* [filters](/questions/tagged/filters "show questions tagged 'filters'")
* [paracompactness](/questions/tagged/paracompactness "show questions tagged 'paracompactness'")
[
](/users/71850/alex-ravsky)
[Alex Ravsky](/users/71850/alex-ravsky)
* 105k
[modified 2 hours ago](/questions/5041944/is-a-filter-of-type-p-contained-in-an-ultrafilter-of-type-p)
2 votes
1 answer
21 views
### [How to find spectrum of rooted binary tree](/questions/5047429/how-to-find-spectrum-of-rooted-binary-tree)
* [linear-algebra](/questions/tagged/linear-algebra "show questions tagged 'linear-algebra'")
* [discrete-mathematics](/questions/tagged/discrete-mathematics "show questions tagged 'discrete-mathematics'")
* [graph-theory](/questions/tagged/graph-theory "show questions tagged 'graph-theory'")
* [trees](/questions/tagged/trees "show questions tagged 'trees'")
* [binary](/questions/tagged/binary "show questions tagged 'binary'")
[
](/users/370330/sandipan-dey)
[Sandipan Dey](/users/370330/sandipan-dey)
* 2,229
[modified 2 hours ago](/questions/5047429/how-to-find-spectrum-of-rooted-binary-tree?lastactivity)
11 votes
1 answer
108 views
### [Is 3L4/5≤2G4/5+A4/5 true for the Logarithmic, Geometric, and Arithmetic means of two positive numbers? Is 4/5 optimal?](/questions/5047992/is-3l4-5-leq2g4-5a4-5-true-for-the-logarithmic-geometric-and)
* [inequality](/questions/tagged/inequality "show questions tagged 'inequality'")
* [logarithms](/questions/tagged/logarithms "show questions tagged 'logarithms'")
* [a.m.-g.m.-inequality](/questions/tagged/a.m.-g.m.-inequality "show questions tagged 'a.m.-g.m.-inequality'")
[
](/users/745350/hbghlyj)
[hbghlyj](/users/745350/hbghlyj)
* 4,993
[modified 2 hours ago](/questions/5047992/is-3l4-5-leq2g4-5a4-5-true-for-the-logarithmic-geometric-and?lastactivity)
1 vote
1 answer
3k views
### [Finding the mean and variance of the number of successes of a sequence of independent trials.](/questions/1163508/finding-the-mean-and-variance-of-the-number-of-successes-of-a-sequence-of-indepe)
* [probability](/questions/tagged/probability "show questions tagged 'probability'")
[
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[Community](/users/-1/community)Bot
* 1
[modified 2 hours ago](/questions/1163508/finding-the-mean-and-variance-of-the-number-of-successes-of-a-sequence-of-indepe?lastactivity)
1 vote
1 answer
42 views
### [Quadratic stabilizability of discrete-time system via LMI](/questions/5047268/quadratic-stabilizability-of-discrete-time-system-via-lmi)
* [control-theory](/questions/tagged/control-theory "show questions tagged 'control-theory'")
* [linear-control](/questions/tagged/linear-control "show questions tagged 'linear-control'")
* [lyapunov-functions](/questions/tagged/lyapunov-functions "show questions tagged 'lyapunov-functions'")
* [linear-matrix-inequality](/questions/tagged/linear-matrix-inequality "show questions tagged 'linear-matrix-inequality'")
* [discrete-time](/questions/tagged/discrete-time "show questions tagged 'discrete-time'")
[
](/users/915271/ujepi)
[ujepi](/users/915271/ujepi)
* 142
[answered 2 hours ago](/questions/5047268/quadratic-stabilizability-of-discrete-time-system-via-lmi?lastactivity)
2 votes
0 answers
86 views
### [Understanding Kolmogorov Backward/Forward equation correctly](/questions/5047278/understanding-kolmogorov-backward-forward-equation-correctly)
* [probability-theory](/questions/tagged/probability-theory "show questions tagged 'probability-theory'")
* [partial-differential-equations](/questions/tagged/partial-differential-equations "show questions tagged 'partial-differential-equations'")
* [stochastic-processes](/questions/tagged/stochastic-processes "show questions tagged 'stochastic-processes'")
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[
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[Another User](/users/1057482/another-user)
* 5,552
[modified 2 hours ago](/questions/5047278/understanding-kolmogorov-backward-forward-equation-correctly)
2 votes
1 answer
55 views
### [Can it be proven that the smallest eigenvalue of a certain matrix increases after taking absolute values of certain entries?](/questions/5047699/can-it-be-proven-that-the-smallest-eigenvalue-of-a-certain-matrix-increases-afte)
* [linear-algebra](/questions/tagged/linear-algebra "show questions tagged 'linear-algebra'")
* [matrices](/questions/tagged/matrices "show questions tagged 'matrices'")
* [eigenvalues-eigenvectors](/questions/tagged/eigenvalues-eigenvectors "show questions tagged 'eigenvalues-eigenvectors'")
* [block-matrices](/questions/tagged/block-matrices "show questions tagged 'block-matrices'")
[
](/users/1551/user1551)
[user1551](/users/1551/user1551)
* 147k
[modified 2 hours ago](/questions/5047699/can-it-be-proven-that-the-smallest-eigenvalue-of-a-certain-matrix-increases-afte?lastactivity)
0 votes
0 answers
23 views
### [Finding intersection of sets defined with linear equations](/questions/5048080/finding-intersection-of-sets-defined-with-linear-equations)
* [linear-algebra](/questions/tagged/linear-algebra "show questions tagged 'linear-algebra'")
* [algorithms](/questions/tagged/algorithms "show questions tagged 'algorithms'")
* [systems-of-equations](/questions/tagged/systems-of-equations "show questions tagged 'systems-of-equations'")
[
](/users/1594153/ric-almeida)
[ric.almeida](/users/1594153/ric-almeida)
* 1
[modified 2 hours ago](/questions/5048080/finding-intersection-of-sets-defined-with-linear-equations)
\-2 votes
0 answers
26 views
### [I woyld like to prove that ⟨λg,∇2f⟩\=λΔf](/questions/5048081/i-woyld-like-to-prove-that-lambda-g-nabla2f-%ce%bb%ce%94f)
* [differential-geometry](/questions/tagged/differential-geometry "show questions tagged 'differential-geometry'")
* [differential](/questions/tagged/differential "show questions tagged 'differential'")
[
](/users/1593267/motra)
[Motra](/users/1593267/motra)
* 1
[asked 2 hours ago](/questions/5048081/i-woyld-like-to-prove-that-lambda-g-nabla2f-%ce%bb%ce%94f)
1 vote
1 answer
481 views
### [F is a sheaf of abelian groups on X. Show that HomAbX(Z\_,F)≅F.](/questions/2069466/mathscrf-is-a-sheaf-of-abelian-groups-on-x-show-that-mathithom-mat)
* [algebraic-geometry](/questions/tagged/algebraic-geometry "show questions tagged 'algebraic-geometry'")
* [category-theory](/questions/tagged/category-theory "show questions tagged 'category-theory'")
* [abelian-groups](/questions/tagged/abelian-groups "show questions tagged 'abelian-groups'")
* [sheaf-theory](/questions/tagged/sheaf-theory "show questions tagged 'sheaf-theory'")
[
](/users/1288963/infty547)
[Infty547](/users/1288963/infty547)
* 53
[modified 2 hours ago](/questions/2069466/mathscrf-is-a-sheaf-of-abelian-groups-on-x-show-that-mathithom-mat?lastactivity)
2 votes
1 answer
36 views
### [Model a finite lattice with an ILP](/questions/5047808/model-a-finite-lattice-with-an-ilp)
* [linear-programming](/questions/tagged/linear-programming "show questions tagged 'linear-programming'")
* [order-theory](/questions/tagged/order-theory "show questions tagged 'order-theory'")
* [mathematical-modeling](/questions/tagged/mathematical-modeling "show questions tagged 'mathematical-modeling'")
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[
](/users/339790/rodrigo-de-azevedo)
[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
* 22.8k
[modified 2 hours ago](/questions/5047808/model-a-finite-lattice-with-an-ilp?lastactivity)
5 votes
0 answers
36 views
### [Approximation of ∫sin(x2)csc(x)dx](/questions/5048077/approximation-of-int-sin-leftx2-right-csc-x-dx)
* [integration](/questions/tagged/integration "show questions tagged 'integration'")
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* [approximation](/questions/tagged/approximation "show questions tagged 'approximation'")
[
](/users/82404/claude-leibovici)
[Claude Leibovici](/users/82404/claude-leibovici)
* 280k
[asked 2 hours ago](/questions/5048077/approximation-of-int-sin-leftx2-right-csc-x-dx)
0 votes
0 answers
66 views
+100
### [A nonconvex optimization problem with nice structures](/questions/5047288/a-nonconvex-optimization-problem-with-nice-structures)
* [linear-algebra](/questions/tagged/linear-algebra "show questions tagged 'linear-algebra'")
* [optimization](/questions/tagged/optimization "show questions tagged 'optimization'")
* [convex-optimization](/questions/tagged/convex-optimization "show questions tagged 'convex-optimization'")
* [non-convex-optimization](/questions/tagged/non-convex-optimization "show questions tagged 'non-convex-optimization'")
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[
](/users/433554/sam)
[Sam](/users/433554/sam)
* 291
[modified 2 hours ago](/questions/5047288/a-nonconvex-optimization-problem-with-nice-structures)
6 votes
1 answer
84 views
### [Is there other method to evaluate ∫∞0xlnnxln(lnx2)x4−1dx?](/questions/5048037/is-there-other-method-to-evaluate-int-0-infty-fracx-ln-n-x-ln-left-l)
* [calculus](/questions/tagged/calculus "show questions tagged 'calculus'")
* [integration](/questions/tagged/integration "show questions tagged 'integration'")
* [definite-integrals](/questions/tagged/definite-integrals "show questions tagged 'definite-integrals'")
* [gamma-function](/questions/tagged/gamma-function "show questions tagged 'gamma-function'")
* [zeta-functions](/questions/tagged/zeta-functions "show questions tagged 'zeta-functions'")
[
](/users/1272731/hyperon)
[Hyperon](/users/1272731/hyperon)
* 1,165
[modified 2 hours ago](/questions/5048037/is-there-other-method-to-evaluate-int-0-infty-fracx-ln-n-x-ln-left-l?lastactivity)
0 votes
1 answer
37 views
### [Name for the vector of derivatives](/questions/5048071/name-for-the-vector-of-derivatives)
* [ordinary-differential-equations](/questions/tagged/ordinary-differential-equations "show questions tagged 'ordinary-differential-equations'")
* [terminology](/questions/tagged/terminology "show questions tagged 'terminology'")
[
](/users/1591192/parfig)
[Parfig](/users/1591192/parfig)
* 546
[answered 3 hours ago](/questions/5048071/name-for-the-vector-of-derivatives?lastactivity)
6 votes
2 answers
484 views
### [Is there a formula for this specific pattern of Pythagorean Triangles sharing an area?](/questions/2448242/is-there-a-formula-for-this-specific-pattern-of-pythagorean-triangles-sharing-an)
* [elementary-number-theory](/questions/tagged/elementary-number-theory "show questions tagged 'elementary-number-theory'")
* [diophantine-equations](/questions/tagged/diophantine-equations "show questions tagged 'diophantine-equations'")
* [pythagorean-triples](/questions/tagged/pythagorean-triples "show questions tagged 'pythagorean-triples'")
[
](/users/4781/tito-piezas-iii)
[Tito Piezas III](/users/4781/tito-piezas-iii)
* 59k
[modified 3 hours ago](/questions/2448242/is-there-a-formula-for-this-specific-pattern-of-pythagorean-triangles-sharing-an?lastactivity)
0 votes
1 answer
2k views
### [Fourier transform of the Hankel function of first kind and zero order](/questions/3274123/fourier-transform-of-the-hankel-function-of-first-kind-and-zero-order)
* [fourier-transform](/questions/tagged/fourier-transform "show questions tagged 'fourier-transform'")
* [bessel-functions](/questions/tagged/bessel-functions "show questions tagged 'bessel-functions'")
* [wave-equation](/questions/tagged/wave-equation "show questions tagged 'wave-equation'")
* [fundamental-solution](/questions/tagged/fundamental-solution "show questions tagged 'fundamental-solution'")
[
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[Community](/users/-1/community)Bot
* 1
[modified 3 hours ago](/questions/3274123/fourier-transform-of-the-hankel-function-of-first-kind-and-zero-order?lastactivity)
1 vote
1 answer
42 views
### [Representation of an ellipse by a covariance matrix - Lissajous form](/questions/5047761/representation-of-an-ellipse-by-a-covariance-matrix-lissajous-form)
* [conic-sections](/questions/tagged/conic-sections "show questions tagged 'conic-sections'")
* [matrix-decomposition](/questions/tagged/matrix-decomposition "show questions tagged 'matrix-decomposition'")
* [quadratic-forms](/questions/tagged/quadratic-forms "show questions tagged 'quadratic-forms'")
* [covariance](/questions/tagged/covariance "show questions tagged 'covariance'")
[
](/users/845581/nikolaij)
[Nikolaij](/users/845581/nikolaij)
* 121
[modified 3 hours ago](/questions/5047761/representation-of-an-ellipse-by-a-covariance-matrix-lissajous-form?lastactivity)
3 votes
0 answers
36 views
### [A Hausdorff topological group can be cover by at most 17 sets of the form akVbk](/questions/5048052/a-hausdorff-topological-group-can-be-cover-by-at-most-17-sets-of-the-form-a-kvb)
* [general-topology](/questions/tagged/general-topology "show questions tagged 'general-topology'")
* [group-theory](/questions/tagged/group-theory "show questions tagged 'group-theory'")
* [topological-groups](/questions/tagged/topological-groups "show questions tagged 'topological-groups'")
[
](/users/83800/gary)
[Gary](/users/83800/gary)
* 35.9k
[modified 3 hours ago](/questions/5048052/a-hausdorff-topological-group-can-be-cover-by-at-most-17-sets-of-the-form-a-kvb)
0 votes
1 answer
45 views
### [An upper bound on AB+BA for A,B≥0](/questions/5048053/an-upper-bound-on-abba-for-a-b-ge-0)
* [linear-algebra](/questions/tagged/linear-algebra "show questions tagged 'linear-algebra'")
* [matrices](/questions/tagged/matrices "show questions tagged 'matrices'")
* [symmetric-matrices](/questions/tagged/symmetric-matrices "show questions tagged 'symmetric-matrices'")
* [positive-semidefinite](/questions/tagged/positive-semidefinite "show questions tagged 'positive-semidefinite'")
[
](/users/339790/rodrigo-de-azevedo)
[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
* 22.8k
[modified 3 hours ago](/questions/5048053/an-upper-bound-on-abba-for-a-b-ge-0?lastactivity)
0 votes
0 answers
12 views
### [Euler characteristic with compact support satisfies the inclusion–exclusion principle](/questions/5048070/euler-characteristic-with-compact-support-satisfies-the-inclusion-exclusion-prin)
* [general-topology](/questions/tagged/general-topology "show questions tagged 'general-topology'")
* [algebraic-topology](/questions/tagged/algebraic-topology "show questions tagged 'algebraic-topology'")
* [reference-request](/questions/tagged/reference-request "show questions tagged 'reference-request'")
[
](/users/139776/hans)
[Hans](/users/139776/hans)
* 3,757
[asked 3 hours ago](/questions/5048070/euler-characteristic-with-compact-support-satisfies-the-inclusion-exclusion-prin)
2 votes
1 answer
155 views
### [Perfect Pascal Mysticum Points](/questions/2609331/perfect-pascal-mysticum-points)
* [combinatorics](/questions/tagged/combinatorics "show questions tagged 'combinatorics'")
* [algebraic-geometry](/questions/tagged/algebraic-geometry "show questions tagged 'algebraic-geometry'")
* [conic-sections](/questions/tagged/conic-sections "show questions tagged 'conic-sections'")
* [plane-geometry](/questions/tagged/plane-geometry "show questions tagged 'plane-geometry'")
[
](/users/344044/rosie-f)
[Rosie F](/users/344044/rosie-f)
* 3,191
[answered 3 hours ago](/questions/2609331/perfect-pascal-mysticum-points?lastactivity)
0 votes
1 answer
51 views
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460 views
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3 votes
0 answers
19 views
### [Building trees with least number of nodes that forms the target sets](/questions/5048035/building-trees-with-least-number-of-nodes-that-forms-the-target-sets)
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[modified 5 hours ago](/questions/5048035/building-trees-with-least-number-of-nodes-that-forms-the-target-sets)
0 votes
1 answer
31 views
### [Computing the determinant of an almost-Toeplitz tridiagonal matrix](/questions/5048005/computing-the-determinant-of-an-almost-toeplitz-tridiagonal-matrix)
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[
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
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[modified 5 hours ago](/questions/5048005/computing-the-determinant-of-an-almost-toeplitz-tridiagonal-matrix?lastactivity)
\-2 votes
0 answers
14 views
### [Pumping Lemma - string partitioning](/questions/5048050/pumping-lemma-string-partitioning)
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[Tomasz P](/users/1295204/tomasz-p)
* 7
[asked 5 hours ago](/questions/5048050/pumping-lemma-string-partitioning)
0 votes
1 answer
25 views
### [Difference between random variable and stochastic process](/questions/5048014/difference-between-random-variable-and-stochastic-process)
* [stochastic-processes](/questions/tagged/stochastic-processes "show questions tagged 'stochastic-processes'")
* [random-variables](/questions/tagged/random-variables "show questions tagged 'random-variables'")
* [stochastic-calculus](/questions/tagged/stochastic-calculus "show questions tagged 'stochastic-calculus'")
[
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[Jayanth R Varma](/users/1564706/jayanth-r-varma)
* 1,299
[answered 5 hours ago](/questions/5048014/difference-between-random-variable-and-stochastic-process?lastactivity)
0 votes
0 answers
19 views
### [What is the most efficient way to verify whether a given square matrix is a Hadamard matrix?](/questions/5047803/what-is-the-most-efficient-way-to-verify-whether-a-given-square-matrix-is-a-hada)
* [linear-algebra](/questions/tagged/linear-algebra "show questions tagged 'linear-algebra'")
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[Rodrigo de Azevedo](/users/339790/rodrigo-de-azevedo)
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[modified 5 hours ago](/questions/5047803/what-is-the-most-efficient-way-to-verify-whether-a-given-square-matrix-is-a-hada)
0 votes
0 answers
31 views
### [What are the 7th and 8th variation of matrix multiplication when dealing with block matrices? What about their BLAS-Level & # for-loops & #flops?](/questions/5047900/what-are-the-7th-and-8th-variation-of-matrix-multiplication-when-dealing-with-bl)
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2 votes
1 answer
39 views
### [Proving a fraction is closer to 1 compared to some other fraction?](/questions/5048029/proving-a-fraction-is-closer-to-1-compared-to-some-other-fraction)
* [inequality](/questions/tagged/inequality "show questions tagged 'inequality'")
* [solution-verification](/questions/tagged/solution-verification "show questions tagged 'solution-verification'")
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[
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[Jayanth R Varma](/users/1564706/jayanth-r-varma)
* 1,299
[answered 5 hours ago](/questions/5048029/proving-a-fraction-is-closer-to-1-compared-to-some-other-fraction?lastactivity)
1 vote
0 answers
27 views
### [Relationship between temperature and probability?](/questions/5048043/relationship-between-temperature-and-probability)
* [probability](/questions/tagged/probability "show questions tagged 'probability'")
* [optimization](/questions/tagged/optimization "show questions tagged 'optimization'")
[
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[user430997](/users/1402059/user430997)
* 241
[asked 5 hours ago](/questions/5048043/relationship-between-temperature-and-probability)
0 votes
0 answers
12 views
### [Why are certain types of optimization algorithms more popular in some fields compared to others?](/questions/5048038/why-are-certain-types-of-optimization-algorithms-more-popular-in-some-fields-com)
* [statistics](/questions/tagged/statistics "show questions tagged 'statistics'")
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[Rócherz](/users/451007/r%c3%b3cherz)
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[modified 5 hours ago](/questions/5048038/why-are-certain-types-of-optimization-algorithms-more-popular-in-some-fields-com)
0 votes
0 answers
17 views
### [Tighter bound for Greedy Set Cover using Harmonic Sum](/questions/5047820/tighter-bound-for-greedy-set-cover-using-harmonic-sum)
* [summation](/questions/tagged/summation "show questions tagged 'summation'")
* [algorithms](/questions/tagged/algorithms "show questions tagged 'algorithms'")
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[MangoPizza](/users/956791/mangopizza)
* 1,880
[modified 6 hours ago](/questions/5047820/tighter-bound-for-greedy-set-cover-using-harmonic-sum)
2 votes
0 answers
39 views
### [On the use of Plancherel's theorem: ‖ˆf‖2\=∞⟹‖f‖\=∞?](/questions/5048036/on-the-use-of-plancherels-theorem-hatf-2-infty-implies-f-infty)
* [real-analysis](/questions/tagged/real-analysis "show questions tagged 'real-analysis'")
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[
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[Bell](/users/679283/bell)
* 88
[modified 6 hours ago](/questions/5048036/on-the-use-of-plancherels-theorem-hatf-2-infty-implies-f-infty)
4 votes
1 answer
75 views
+50
### [Is the tangent bundle of an almost complex manifold also almost complex?](/questions/5046595/is-the-tangent-bundle-of-an-almost-complex-manifold-also-almost-complex)
* [vector-bundles](/questions/tagged/vector-bundles "show questions tagged 'vector-bundles'")
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[user3257842](/users/365433/user3257842)
* 4,276
[modified 6 hours ago](/questions/5046595/is-the-tangent-bundle-of-an-almost-complex-manifold-also-almost-complex?lastactivity)
1 vote
1 answer
25 views
### [Trying to understand p-adic analysis and how it applies to polynomial roots](/questions/5048031/trying-to-understand-p-adic-analysis-and-how-it-applies-to-polynomial-roots)
* [polynomials](/questions/tagged/polynomials "show questions tagged 'polynomials'")
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[Qiaochu Yuan](/users/232/qiaochu-yuan)
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[answered 6 hours ago](/questions/5048031/trying-to-understand-p-adic-analysis-and-how-it-applies-to-polynomial-roots?lastactivity)
0 votes
1 answer
97 views
### [Accessing non-constructible sets](/questions/5047734/accessing-non-constructible-sets)
* [set-theory](/questions/tagged/set-theory "show questions tagged 'set-theory'")
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[spaceisdarkgreen](/users/397125/spaceisdarkgreen)
* 65.1k
[answered 7 hours ago](/questions/5047734/accessing-non-constructible-sets?lastactivity)
0 votes
0 answers
31 views
+50
### [Gradient as a covariant vector in Lee smooth manifolds. Incorrect formula?](/questions/5046541/gradient-as-a-covariant-vector-in-lee-smooth-manifolds-incorrect-formula)
* [manifolds](/questions/tagged/manifolds "show questions tagged 'manifolds'")
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[
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[qubitz](/users/590794/qubitz)
* 101
[modified 8 hours ago](/questions/5046541/gradient-as-a-covariant-vector-in-lee-smooth-manifolds-incorrect-formula)
0 votes
0 answers
13 views
### [Some inequalities about Voronoi cell and covering radius of a lattice](/questions/5047987/some-inequalities-about-voronoi-cell-and-covering-radius-of-a-lattice)
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1 vote
0 answers
62 views
### [Why doesn't change of variables preserve absolute value?](/questions/5047977/why-doesnt-change-of-variables-preserve-absolute-value)
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[RobPratt](/users/683666/robpratt)
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[modified 10 hours ago](/questions/5047977/why-doesnt-change-of-variables-preserve-absolute-value)
3 votes
3 answers
180 views
### [Is it possible for a diffeomorphism on a connected smooth manifold to fix a nonempty open set and not be the identity?](/questions/5047756/is-it-possible-for-a-diffeomorphism-on-a-connected-smooth-manifold-to-fix-a-none)
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[Just a user](/users/977740/just-a-user)
* 19.3k
[modified 10 hours ago](/questions/5047756/is-it-possible-for-a-diffeomorphism-on-a-connected-smooth-manifold-to-fix-a-none?lastactivity)
3 votes
1 answer
162 views
+50
### [Does the iteration ni+1\=ni+⌊ni2⌋ have a closed form expression?](/questions/5041576/does-the-iteration-n-i1-n-i-left-lfloor-fracn-i2-right-rfloor-ha)
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[RobPratt](/users/683666/robpratt)
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2 votes
1 answer
88 views
### [If a function is regular at every point of an open set corresponding to a maximal ideal, is it regular on the open set?](/questions/5047875/if-a-function-is-regular-at-every-point-of-an-open-set-corresponding-to-a-maxima)
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[Joe](/users/623665/joe)
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1 vote
1 answer
39 views
### [Isomorphisms theorem adjacent for Homeomorphisms](/questions/5047647/isomorphisms-theorem-adjacent-for-homeomorphisms)
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[Qiaochu Yuan](/users/232/qiaochu-yuan)
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[answered 13 hours ago](/questions/5047647/isomorphisms-theorem-adjacent-for-homeomorphisms?lastactivity)
5 votes
0 answers
139 views
### [Exploring some beautiful variants of the Recamán sequence](/questions/5046812/exploring-some-beautiful-variants-of-the-recam%c3%a1n-sequence)
* [sequences-and-series](/questions/tagged/sequences-and-series "show questions tagged 'sequences-and-series'")
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[Augusto Santi](/users/747850/augusto-santi)
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[modified 13 hours ago](/questions/5046812/exploring-some-beautiful-variants-of-the-recam%c3%a1n-sequence)
10 votes
2 answers
450 views
### [Solving integral ∫x+√1+x+x21+x+√1+x+x2dx](/questions/758106/solving-integral-int-fracx-sqrt1xx21x-sqrt1xx2-mathrmdx)
* [calculus](/questions/tagged/calculus "show questions tagged 'calculus'")
* [integration](/questions/tagged/integration "show questions tagged 'integration'")
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[Quanto](/users/686284/quanto)
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[modified 13 hours ago](/questions/758106/solving-integral-int-fracx-sqrt1xx21x-sqrt1xx2-mathrmdx?lastactivity)
0 votes
1 answer
30 views
### [Particular name for the second propositional variable in the hypothetical syllogism?](/questions/5047945/particular-name-for-the-second-propositional-variable-in-the-hypothetical-syllog)
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[answered 14 hours ago](/questions/5047945/particular-name-for-the-second-propositional-variable-in-the-hypothetical-syllog?lastactivity)
12 votes
2 answers
133 views
### [How to visualize cosh(sinh−1(x)) or sinh(cosh−1(x))?](/questions/5047852/how-to-visualize-cosh-sinh-1x-or-sinh-cosh-1x)
* [trigonometry](/questions/tagged/trigonometry "show questions tagged 'trigonometry'")
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[
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[Dan](/users/1374/dan)
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[answered 15 hours ago](/questions/5047852/how-to-visualize-cosh-sinh-1x-or-sinh-cosh-1x?lastactivity)
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