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Interesting 10 Bountied Hot Week Month
2 votes
4 answers
182 views

Finding the angles of a non-equilateral $\triangle ABC$ with centroid $G$ such that $\angle GAB=\angle GCA=30^\circ$

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Blue
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0 votes
2 answers
99 views

LP Constraint Problem

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callculus42
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2 votes
3 answers
231 views

Prove that $a^1 \cong a$

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Attila Vajda
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0 answers
21 views

Proof of embeddibility of projective smooth $k$-scheme with dimension $d$ in $\mathbb{P}^{2d+1}_k$ ( Part 2, Gortz, Wedhorn )

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Plantation
  • 4,056
5 votes
3 answers
214 views

Expectation of an absolute value

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Letac Gérard
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1 vote
1 answer
58 views

How the multiplication in Ring-LWE is defined?

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138 Aspen
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0 votes
1 answer
766 views

Separable kernel in convolution

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0 votes
0 answers
10 views

What is this lattice property I'm looking at?

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Dan
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4 votes
1 answer
487 views

Necessary and sufficient conditions for the convergence of a series of complex terms

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Daniele Tampieri
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0 answers
18 views

Why does the Generalized Collatz map ($3n+k$) with $k=3^x+2^x$ produce 1,023 cycles at $x=15$, but collapse to 1 cycle for $x \ge 21$?

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MathPatterns
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2 votes
3 answers
3k views

Find all generators of $ (\mathbb{Z}_{27})^{\times} $

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Fuat Ray
  • 1,342
7 votes
2 answers
186 views

Stuck on part (b) of Rising Sun Lemma exercise

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Louis
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0 answers
6 views

Stochastic exponential and martingales

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Ruebli
  • 61
4 votes
1 answer
153 views

Maybe an integral inequality in discrete form?

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flower417477
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1 vote
0 answers
33 views

Can we prove that the limit $e = \lim_{h \to 0^+} (h + 1)^{\frac1h}$ exists using the fact that the function in the limit always decreases for $h>0$?

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Name
  • 305
8 votes
1 answer
558 views

Number of lattice points inside a circle in general position

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mezzoctane
  • 1,454
2 votes
3 answers
116 views

Is there a similar way of proving this statement when $\mathbb{K}=\mathbb{F_2}$?

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user1551
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1 vote
2 answers
817 views

Interval of Convergence for a Differential Equation

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1 vote
1 answer
14 views

Equality related to random variable and its conditional expectation.

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Davide Giraudo
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3 votes
3 answers
548 views

Number of words with 8 letters using an alphabet of 3 consonants and 2 vowels with constraints

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lucy
  • 71
0 votes
1 answer
25 views

Binomial sum without using sterling numbers

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匚ㄖㄥᗪ乇ᗪ
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0 votes
0 answers
10 views

On the convolution identity of a sub arc of circle and the open set which is thickened epsilon amount of another subarc in circle.

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Umar Khaiam
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11 votes
1 answer
960 views

Conditional expectation continuous in the conditioning argument?

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user408858
  • 3,520
18 votes
6 answers
3k views

Book on combinatorial identities

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DroneBetter
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0 votes
0 answers
31 views

How to find all polyominoes that are intersections of the integer lattice with an open disk?

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mezzoctane
  • 1,454
1 vote
0 answers
68 views

Parametrization $p x^2 + q y^2 = z^3 + r$

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Dmitry Ezhov
  • 1,830
0 votes
1 answer
765 views

How to translate a slanted cylinder? ( iso-surface geometry)

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2 votes
0 answers
295 views

What is an example for a GCD domain that is neither a UFD (like $\Bbb Z[X]$) nor Bézout (like holomorphic functions on all of $\Bbb C$)?

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hongliang tao
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2 votes
3 answers
178 views

Analytic sum of an alternating series$\sum\limits_{n=1}^{\infty}(-1)^{n} \frac{n}{\left(n+\sqrt{a+n^2}\right)^2}$

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Svyatoslav
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0 votes
0 answers
16 views

Complex Hessian comparison for Kähler manifolds with bisectional curvature bounded from below

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HeroZhang001
  • 3,325
2 votes
1 answer
165 views

summing a row of the Stirling subset triangle times falling powers divided by ordinary powers

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DroneBetter
  • 604
9 votes
3 answers
398 views

Can divergent series be useful?

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DroneBetter
  • 604
0 votes
1 answer
118 views

Random variable $X$ has exponential distribution with parameter $1$. What's the probability of $p(X\leq2)$

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DroneBetter
  • 604
0 votes
1 answer
44 views

Position of two points with respective to a given straight line

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habualfa
  • 36
1 vote
1 answer
30 views

Function continuous nowhere whose domain and range are $[0,1]$

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Arthur
  • 206k
13 votes
2 answers
397 views

Showing that $\frac{\tan(x^\circ)}{\tan(y^\circ)}= \frac{\tan(9^\circ)}{\tan(57^\circ)}$ has exactly six solutions for integers $x,y\in(0,90)$

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Limerence Abyss
  • 361
0 votes
2 answers
10k views

In how many ways can the letters of the word ARRANGEMENTS be arranged? A)Probability arrangement begin with EE. B)Probability consonants are together.

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true blue anil
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3 votes
0 answers
162 views
+50

Rational points and sections on a family of genus-3 hyperelliptic curves

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Anonymous-math-guest
  • 161
5 votes
1 answer
931 views

Smallest Number of Strings to Distinguish $n$ Pairwise $L$-distinguishable Strings

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1 vote
0 answers
19 views

Counting disjoint $k$-tuples of lines in $\mathbb F_q^n$

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Jyrki Lahtonen
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0 votes
0 answers
30 views

Equivalent definitions of vector-valued Riemann integral

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WillG
  • 7,759
10 votes
4 answers
281 views

Evaluate: $4^9-\binom{8}{1}4^8+\binom{7}{2}4^7-\binom{6}{3}4^6+\binom{5}{4}4^5$

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D S
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2 votes
0 answers
18 views

A Principled(?) Way to Determine a Lie Algebra Automorphism from a Dynkin Diagram Automorphism (and invariant subalgebra)

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FamisherCaterpillar
  • 179
2 votes
2 answers
186 views

Doubt in Stokes' theorem & line integral

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mark haokip
  • 593
2 votes
2 answers
833 views

Two $1$-dim random walkers separated by a distance $d$ will meet at or before time $t$.

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CommunityBot
  • 1
1 vote
1 answer
532 views

An upper bound for $-\frac{\zeta'}{\zeta}(s)-\frac{1}{s-1}$

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DroneBetter
  • 604
1 vote
1 answer
506 views

Riemann zeta function, Stirling's numbers, and infinite series of rising/falling powers over ordinary powers

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DroneBetter
  • 604
1 vote
0 answers
16 views

Every k-fold cover of the real line by intervals can be decomposed into k distinct covers.

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psychohistorian
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7 votes
4 answers
283 views

What is the correct definition of a limit point in real analysis?

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user21820
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0 votes
0 answers
16 views

Continuity of functions in b-metric spaces

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mark haokip
  • 593
2 votes
1 answer
1k views

Dimension of a diagonalizable matrix

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0 votes
1 answer
68 views

How many odd numbers are there in one row in Pascal's triangle?

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Bill Dubuque
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0 votes
2 answers
75 views

How $\min(x,y)$ works in reasoning

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Bill Dubuque
  • 285k
2 votes
0 answers
36 views

Can you find a great circle with only a compass?

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Steven Stadnicki
  • 53.4k
0 votes
1 answer
262 views

Partial sum of Stirling numbers of the second kind with falling factorial

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DroneBetter
  • 604
2 votes
2 answers
162 views

What is wrong with my derivation of the surface area of a sphere?

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Daniel Smania
  • 8,777
1 vote
1 answer
34 views

Generalization of Cauchy's functional equation. What are the general solutions, $f$?

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Bruno Andrades
  • 5,288
1 vote
1 answer
54 views

Density of the set of positive triplets $(x,y,z)$ such that $x^{n_1}+y^{n_2}=z^{n_3}$ for positive integers $n_i$ in the halfopen unit cube $(0,1]^3$

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hbghlyj
  • 6,019
1 vote
1 answer
467 views

Showing ${n\brace k}^2>{n\brace k-1}{n\brace k+1}$ by induction on $n$

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DroneBetter
  • 604
2 votes
1 answer
151 views

How do you think about uniform continuity?

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Ben
  • 7,341
4 votes
2 answers
86 views

Known properties of these generalized Cauchy distributions

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user408858
  • 3,520
3 votes
1 answer
539 views

No eigenvalue of a graph is larger than the maximum degree

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minh quý lê
  • 295
3 votes
1 answer
148 views

Cubic non-residue calculation

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Jeff Margrave
  • 43
0 votes
2 answers
57 views

How can I derive a smooth, non-singular force formula from a uniformly dense rod in $\mathbb{R}^{1}$?

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Teepeemm
  • 979
1 vote
1 answer
31 views

Periodic Orbits of Arbitrarily Small Period for a Flow Without Fixed Points

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Massimiliano de Sa
  • 33
10 votes
3 answers
581 views

Integral $\int_0^{\infty} \arctan{\left(\frac{n}{\cosh{(x)}}\right)} \mathop{dx}$

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Quanto
  • 124k
0 votes
0 answers
51 views

Limit of the function satisfying $f(x)=x-f(x^2)$ as $x\to 1^-$

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user1776247
  • 81
1 vote
1 answer
1k views

If a sequence of functions is zero almost everywhere and converges pointwise almost everywhere, does the same hold for a limit?

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CommunityBot
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0 votes
1 answer
53 views

$f: \mathbb{RP}^n \to \mathbb{RP}^m$ for $n > m$ induces trivial map on reduced cohomology

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Ben Steffan
  • 10.7k
1 vote
2 answers
77 views

How to find general solution to differential equation given a particular solution

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Gonçalo
  • 16.5k
0 votes
0 answers
30 views

“Central limit theorem” for symmetric random variables with no finite mean

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triple_sec
  • 24k
5 votes
2 answers
2k views

Example of two field extensions such that their tensor product is not a field

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Martin Sleziak
  • 56.4k
0 votes
1 answer
1k views

Algebraic Geometry and its application to Cryptography

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CommunityBot
  • 1
5 votes
1 answer
79 views

A gap in a game theory derivation

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138 Aspen
  • 1,293
1 vote
0 answers
28 views

How are defined these double complexes in Bott Tu, Section 14?

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Samy
  • 11
0 votes
1 answer
34 views

Is $A_{\epsilon}=\{x \in X: d(x,A) \leq \epsilon\}$ a continuum metric space?

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Lorago
  • 12.6k
4 votes
1 answer
201 views

How to prove that $\lim\limits_{n\to\infty} \sum\limits_{k=1}^n\left(\sqrt[p]{\frac{n^p+k^{p-1}}{n^p}}-1\right)=\frac1{p^2}$ for all $p\in\mathbb{R}$?

pie's user avatar
pie
  • 9,035
1 vote
1 answer
107 views

Proof that $F$ is an algebra over $\Bbb R$

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Anne Bauval
  • 51.1k
0 votes
1 answer
36 views

Computing Fourier transform for a real odd signal

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Srini
  • 2,275
0 votes
0 answers
21 views

Practical and historical role of Jordan measure

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S.H.W
  • 4,318
0 votes
0 answers
17 views

Asymptotic Expansion of Bessel Function using Sommerfeld Contour

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Joel Storch
  • 368
0 votes
0 answers
14 views

Is a collinearity step missing in this Miquel point proof?

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Ahan
  • 139
4 votes
3 answers
1k views

Applications and uses for the Lebesgue number of a open cover

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pyridoxal_trigeminus
  • 3,376
3 votes
1 answer
772 views

Properties of horizontal divisors on a fibered surface.

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CommunityBot
  • 1
2 votes
0 answers
52 views

Does Blaschke’s characterization of ellipsoids extend to non-compact convex body?

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hbghlyj
  • 6,019
1 vote
0 answers
33 views

How much less is the arithmetic mean than the max given the average deviation?

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Dair
  • 3,682
0 votes
0 answers
54 views
+50

Proving bounds for differential equation system?

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Brenda
  • 107
1 vote
0 answers
22 views

Criterion for abelian subcategory

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psl2Z
  • 7,066
1 vote
1 answer
334 views

Bott and Tu Spectral Sequence of a Double Complex

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Samy
  • 11
2 votes
0 answers
56 views

Conversion between Cartier Divisors, Weil Divisors, Line Bundles and Invertible Sheaves.

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William
  • 81
1 vote
1 answer
105 views

Prove that $\int_0^1\operatorname{Li}_2\left(\frac{1-x^2}{4}\right)\frac{2}{3+x^2}\,\mathrm dx= \frac{\pi^3 \sqrt{3}}{486}$

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Sangchul Lee
  • 185k
121 votes
7 answers
48k views

What would base $1$ be?

MJD's user avatar
MJD
  • 68k
2 votes
3 answers
1k views

What does wedge or caret mean in a matrix context?

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M Marques
  • 1
1 vote
0 answers
31 views

Ideal of maximal minors is radical when rank never drops by more than 1 [Reference request]

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Leobeth
  • 2,878
3 votes
1 answer
173 views
+50

For which real $\beta$ there exist concave(convex upwards) functions $f, g: (0;1) \to (0;+\infty)$ such that $\frac{f(x)}{g(x)}=(1+x)^\beta$?

pioo's user avatar
pioo
  • 553
2 votes
1 answer
53 views

Counterexample request: $\sigma$-algebra with no smallest set containing a given (non-measurable) set?

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Michael Greinecker
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