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Interesting 15 Bountied Hot Week Month
1 vote
0 answers
19 views

Dissecting $\mathrm{Aut}(Z/p^n \times Z/p^m)$

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UGOBEL
  • 133
1 vote
2 answers
523 views

Counter Example: Subset of $\mathbb{R}$ such that every bounded continuous function extended to continuous function, then the subset is closed

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Zheng L.
  • 345
0 votes
0 answers
3 views

Can the outer measure of a generating set equal its generating set function value if this set function is not a pre-measure?

Timothy's user avatar
Timothy
  • 368
0 votes
0 answers
24 views

I solved part a, but am not sure how to even approach/solve part b&c

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Ben Steffan
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1 vote
1 answer
32 views

Sum of pairwise Euclidean distances in an $M\times N$ grid and asymptotics

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French Man
  • 1,210
0 votes
0 answers
24 views

I have a question about a proof used in my foundations of analysis class:

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love4code
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2 votes
0 answers
93 views
+50

Composition of analytic functions

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St. Barth
  • 1,654
3 votes
0 answers
219 views

Binary eigenvalues matrices and continued fractions

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DVD
  • 1
2 votes
2 answers
81 views

Circulation around a parametric curve using Stokes' Theorem.

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Ted Shifrin
  • 129k
4 votes
2 answers
350 views

Product of binary matrices with binary eigenvalues

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DVD
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1 vote
0 answers
12 views

Duchhardt's thinning operators and $\Pi_4$-reflection: what is its intention and why is it more complex than Rathjen's $\Pi_3$-reflecting function?

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Alexandre Vachon
  • 11
2 votes
1 answer
633 views

Finding vertex-cut using Menger's theorem

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CommunityBot
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1 vote
1 answer
384 views

Prove that the Laplace expansion for the determinant is the same for any choice of row or column

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user1551
  • 152k
0 votes
0 answers
20 views

Analytical solution or symmetry reduction for the non-linear ODE $(u'')^2 = -8u u' x^2$

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GUDIMELLA VENKATA HARSHA VARDH
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3 votes
1 answer
87 views

Is it possible to embed a Tarski monster group into SO(3)?

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user1729
  • 33k
3 votes
1 answer
83 views

The probability that two random chords on a circle intersect.

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Nate
  • 999
3 votes
2 answers
826 views

Find cumulative days in a date

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fleablood
  • 135k
9 votes
4 answers
617 views

Evaluation of $\lim_{n\rightarrow \infty}\frac{1}{2n}\cdot \ln \binom{2n}{n}$

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Nate
  • 999
6 votes
3 answers
652 views

Find parametric expression of an arc given its start point, end point and central angle in 3D cartesian coordinate system

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Nate
  • 999
0 votes
1 answer
149 views

Laplace Transform

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2 votes
0 answers
69 views

Proof for generating function for the coefficient of $x^n$ in $(1+mx+x^2)^n$

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RobPratt
  • 52.8k
28 votes
5 answers
677 views

Special partition of the set $[n]$

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RobPratt
  • 52.8k
0 votes
0 answers
6 views

Asymptotic Taylor-Maccoll Equation as Freestream Mach Number Approaches Infinity

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Jacob Ivanov
  • 381
5 votes
2 answers
161 views

Closed-form eigenvalues for (almost) Toeplitz matrix

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Bob Terrell
  • 3,947
2 votes
0 answers
51 views

Is $R \otimes_R -$ exact in the category of all modules?

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Mark Sandey
  • 80
8 votes
2 answers
201 views

Is there a set $A\subseteq\mathbb{R}$ that is not dense, not bounded from above, and not bounded from below such that $A+A=3A$?

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mihaild
  • 18.9k
0 votes
1 answer
657 views

Loss function and its risk function

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A rural reader
  • 3,013
2 votes
2 answers
52 views

Why images of an element of a number field $K$ under embeddings from $K$ to $\mathbb{C}$ are distributed equally in number?

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Anuradha N.
  • 938
1 vote
1 answer
30 views

Existence of Surjective *-Homomorphisms Between Continuous Function Algebras on Circle Products

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David Gao
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0 votes
0 answers
12 views

Absolute Continuity of Counting Measure and Empircal Measure

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gokudegrees
  • 77
1 vote
1 answer
466 views

Solving a circular permutation related problem

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Martin Hansen
  • 1,960
1 vote
1 answer
25 views

Permanent of Adjacency Matrix

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Robert Israel
  • 475k
2 votes
0 answers
55 views

Smallest examples of odd-order groups with large derived length

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Vladimir Yankovskiy
  • 123
9 votes
5 answers
320 views

Prove $\frac{8}{\pi^2-4 x^2}<\frac{\tan x}{x}<\frac{\pi^2}{\pi^2-4 x^2}$ for $0 < x < \pi/2$

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Angelo
  • 15.4k
2 votes
2 answers
115 views

Update a doubly stochastic matrix

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greg
  • 41k
3 votes
3 answers
291 views

Extended Eisenstein's Irreducibility Criterion Proof

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ApexPandora
  • 378
3 votes
1 answer
198 views

A conjecture relating to the limit of a sequence of matrix determinants

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Salmon
  • 3,029
5 votes
1 answer
1k views

Proving the Leibniz formula for determinants

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user1551
  • 152k
1 vote
1 answer
40 views

Properties of field extensions which apply to the whole field if and only if they apply to its generators

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octopus
  • 1,354
1 vote
0 answers
95 views

Expand an elementary function into a Maclaurin series

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Daniele Tampieri
  • 11k
0 votes
1 answer
644 views

Laplace transform of a one-sided full-wave rectified...

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CommunityBot
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1 vote
1 answer
47 views

A question related to curve orientation from Professor Do Carmo's textbook.

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Anne Bauval
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0 votes
0 answers
53 views

Do there exist a non-trivial paraconsistent logic LP and a theory N such that (LP,N) proves the classical consistency of ZFC?

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fosewo
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1 vote
1 answer
29 views

What is meant by functorially obtained factorisations of the model structure?

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Martin Brandenburg
  • 185k
2 votes
0 answers
55 views

Homogeneous generators for inverse limit of graded modules

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Salmon
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2 votes
1 answer
60 views

Proving the Optimality of Greedy Color Assignment to a Sequence

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Nhật Minh Bùi
  • 128
3 votes
0 answers
57 views

Existence of a plane curve where the sum of perpendicular chord segments is constant

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pie
  • 10.3k
1 vote
0 answers
80 views

Generating Functions - How many numbers have $18$ as the sum of their digits

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Martin Hansen
  • 1,960
1 vote
1 answer
814 views

Inclusion-Exclusion Principle; certain intersection has to be empty

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ApexPandora
  • 378
10 votes
2 answers
243 views

Is there a smooth bounded $f$ such that for all distinct nonnegative integers $m,n$ and all $x\in\mathbb{R}$ we have $f^{(m)}(x)\neq f^{(n)}(x)$?

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Martin R
  • 136k
3 votes
1 answer
100 views

Show that $\int_0^{\infty} \frac{1}{(\pi^2+\ln^2(x))^2(x+1)^2} dx=\frac{1}{360}\left({\frac{\zeta(2)}{\zeta(4)} + \frac{\zeta(3)}{\zeta(4)}}\right)$

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mezzoctane
  • 2,803
2 votes
1 answer
69 views

Method to solve probabilistic graph problem

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Misha Lavrov
  • 164k
4 votes
1 answer
85 views

Help with maximization problem (related to proof of Kelly Criterion)

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Rodrigo de Azevedo
  • 24.1k
0 votes
4 answers
801 views

Can two singular matrices ever be row equivalent?

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CommunityBot
  • 1
12 votes
6 answers
476 views

Finding the product of the real roots of $\frac{2x^2 + x + 1}{x^2 - x + 1} = \frac{x^2 - x + 3}{3x^2 + 3x - 3}$

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Poojitha L
  • 1
8 votes
3 answers
2k views

Prove that semi-simple rings are Dedekind-finite

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Kadmos
  • 4,027
-1 votes
0 answers
61 views

Integral convergence at $\infty$ when $f(x)$ is not infinitesimal

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ApexPandora
  • 378
3 votes
1 answer
208 views

Any reason why these numbers are close to integers?

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W. Cadegan-Schlieper
  • 797
2 votes
2 answers
366 views

Peetre's Inequality - not strict?

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K. Hirao
  • 129
2 votes
0 answers
73 views

Are there "normable" spaces and "normability" theorems, as in metrizable spaces and metrization theorems?

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powerline
  • 1,158
3 votes
3 answers
1k views

Cardinality of the set of all (real) discontinuous functions

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Salmon
  • 3,029
1 vote
2 answers
358 views

Solution to Dirichlet problem and Brownian motion

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BoiBhai
  • 167
0 votes
0 answers
66 views

Are my understanding of strong and weak induction and the proof of their equivalence is correct?

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ryang
  • 46.1k
1 vote
1 answer
641 views

How to find Lie point symmetry?

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CommunityBot
  • 1
16 votes
3 answers
758 views

Compare $\log_5(\log_4 3)$ and $\log_6(\log_6 3)$

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Игорь
  • 1,111
2 votes
2 answers
169 views

Uniform convergence of continuous periodic functions

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Kostya_I
  • 1,454
1 vote
1 answer
49 views

Can these class of equivalences be proven in intuitionistic first-order logic with equality?

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Carl Mummert
  • 88k
0 votes
1 answer
73 views

Are there $A,B\subseteq\mathbb{R}$ that are not bounded from below, not bounded from above, not dense, and not countable with $A+B=AB$?

Salmon's user avatar
Salmon
  • 3,029
8 votes
4 answers
567 views

Simple objects in category of quasi-coherent sheaves

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Mahdi Majidi-Zolbanin
  • 109
18 votes
4 answers
680 views
+100

Primes for which sum of sine ratios is nearly always an integer

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David E Speyer
  • 65.2k
0 votes
0 answers
53 views

the unit normal field $N$ to $\partial M$ in Munkres' “Analysis on Manifolds”

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Arctic Char
  • 17.2k
1 vote
0 answers
14 views

Generators and Kolmogorov equations for CTMCs on countable state spaces

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Jaimi
  • 690
2 votes
0 answers
92 views

Find $\min \|\vec{V} - \vec{U}\| + \left|\sqrt{\|\vec{U}\|^2 + 1} - \sqrt{\|\vec{W}\|^2 + 1}\right|+\| \vec{W} - \vec{V'} \|$

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JHT
  • 526
4 votes
1 answer
48 views

Non projective locally free f.g. module

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Lukas Heger
  • 27.2k
1 vote
0 answers
63 views

Asymptotic viability of a symmetrical, prime-offset heuristic for Legendre's Conjecture

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Dominique
  • 3,650
1 vote
1 answer
74 views

Is the derivative of a monotone function measurable? (Justifying Tonelli in a distribution function identity)

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Shavit
  • 469
11 votes
0 answers
307 views
+400

Which measurable spaces are finitely presentable?

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Martin Brandenburg
  • 185k
4 votes
1 answer
170 views

Minimal conditions required to randomly form a sphere

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Emar
  • 550
12 votes
0 answers
389 views
+200

Choosing products in categories appearing in practice

Martin Brandenburg's user avatar
Martin Brandenburg
  • 185k
6 votes
1 answer
178 views

What do we call a category in which every monomorphism is regular?

Martin Brandenburg's user avatar
Martin Brandenburg
  • 185k
0 votes
0 answers
18 views

Are these two version of the Chowla conjecture equivalent?

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user1484024
  • 1
1 vote
0 answers
32 views

For "closed subgroup" theorems, do we need G to be simply connected?

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Marcos Martínez Wagner
  • 757
0 votes
0 answers
30 views

Equivalent Axiomatization of Hilbert Algebras

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Martin Brandenburg
  • 185k
1 vote
0 answers
74 views

Optimal Strategy in Drawing Balls from Two Urns

Martin Hansen's user avatar
Martin Hansen
  • 1,960
2 votes
0 answers
23 views

References for suspension flows of $\mathbb{Z}^d$-actions

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Lior Tenenbaum
  • 21
2 votes
0 answers
67 views

Is the number of compositions of the $n \times n$ grid graph even for $n>1$?

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Salmon
  • 3,029
2 votes
1 answer
644 views

Large rectangle with perimeter 300 cm divided into smaller identical rectangles.

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CommunityBot
  • 1
11 votes
0 answers
191 views

Is there a nonaffine smooth function $f:\mathbb{R}\to\mathbb{R}$ such that $f(\mathbb{Q})=\mathbb{Q}$?

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Salmon
  • 3,029
2 votes
1 answer
106 views
+100

Showing cardinality of finite fibers are constant a.e.

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SyntaxError
  • 1
8 votes
0 answers
206 views

Exterior Derivative Intuition

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fweth
  • 3,910
1 vote
1 answer
653 views

Integrating areas in the complex plane

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CommunityBot
  • 1
2 votes
1 answer
48 views

Riemann condition for the Riemann-Stieltjes integral when the integrator is of bounded variation, what would that look like?

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Jayanth R Varma
  • 6,065
7 votes
1 answer
301 views

What do equalizers of ordinal numbers look like?

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bof
  • 83.9k
0 votes
1 answer
62 views

Is there a smooth function $f:\mathbb{R}^{m}\to M$ such that $f|_{U′}=\phi^{-1}$?

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Salmon
  • 3,029
0 votes
1 answer
659 views

Field extension, why $i(k)=j(k)=k$?

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CommunityBot
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1 vote
0 answers
67 views

Prove that $A,R,S,D$ are concyclic.

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