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Interesting 16 Bountied Hot Week Month
3 votes
1 answer
236 views
+50

Conjecture about the Levenshtein difference of prime multplicative groups mod $p$.

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Ambrose Rutherford
  • 52
0 votes
2 answers
81 views

Proving that $x := x - yt$; $y := y + xt$ traces an ellipse

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Bojidar Marinov
  • 101
2 votes
0 answers
21 views

Solving the functional equation $f(f(x)+y) + xf(y) = f(xy+y) + f(x)$

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daw
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3 votes
2 answers
50 views

How to solve $\lim_{x \to 0} \frac{e^x - e^{\sin(x)}}{x-\sin(x)}$

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Átila Correia
  • 19.5k
-1 votes
0 answers
36 views

why doesn't convergence require the sequence decrease to be larger than the series increase?

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Ethan B.
  • 1
1 vote
1 answer
1k views

Confidence Intervals with two variables

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CommunityBot
  • 1
-3 votes
0 answers
58 views

What notation should I use for domain

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Rócherz
  • 4,281
2 votes
2 answers
74 views

Let $a>1$, $b>0$ and $c=a+b$. Solve in $\mathbb{R}$ the equation $ (a^{x}+b)^{\log_{c} a} = c^{x} - b$

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Angelo
  • 14.5k
2 votes
0 answers
59 views

Question regarding a combinatorial map between two sets for proving hermite identity

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Ciderate
  • 21
1 vote
0 answers
23 views

Wikipedia’s proof of the Laplace’s method of integration

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Rócherz
  • 4,281
0 votes
1 answer
31 views

$3^x\times 7+\color{orange}{475}=2^y$ has no integer solutions?

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CosmicOscillator
  • 2,344
-1 votes
1 answer
69 views

What are some common notations for sets of numbers (e.g. $\mathbb{N,\ Z,\ Q,\ R}$)

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freakish
  • 47.8k
1 vote
1 answer
65 views

Questions on the proof of Theorem 2 in Ireland-Rosen CIMNT: if $p$ is an odd prime and $l\geq 1$, then there exists a primitive root mod $p^l$

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MAV
  • 21
1 vote
0 answers
67 views

The Newtonian Gravitational field - ode property

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Gonçalo
  • 16.6k
0 votes
0 answers
119 views

Autonomous ordinary differential equation

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Gonçalo
  • 16.6k
1 vote
1 answer
66 views

Check the DNF of this formula (SymPy)

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Tankut Beygu
  • 4,951
2 votes
0 answers
39 views

On $\sum_{k=0}^{n-1}\,(-1)^k\,\frac{(\pi/2)^{-2k}}{(2n-2k)!}\,\beta(2k+1)$

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Hazem Orabi
  • 5,282
1 vote
0 answers
6 views

Boundary map for Schubert cells

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stranger
  • 621
1 vote
0 answers
79 views

Admission Test - Differential Equations

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Gonçalo
  • 16.6k
0 votes
1 answer
42 views

Check the convergence of the integration

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Steven
  • 3,581
0 votes
1 answer
1k views

Barred and unbarred systems

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  • 1
11 votes
3 answers
158 views

Why does $\left(1+\frac1{x-0.5}\right)^x$ converge to $e$ quicker than $\left(1+\frac1x\right)^x\approx e$?

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Maxime Jaccon
  • 5,656
0 votes
0 answers
18 views

(When) do orientation sections pull back?

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Arnav Das
  • 218
5 votes
2 answers
157 views

Checking if the determinant of a quasi-tridiagonal matrix is nonzero

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Martin R
  • 133k
2 votes
0 answers
69 views

Finite CW complexes that are infinite loop spaces

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user39598
  • 1,751
2 votes
0 answers
73 views

$(X, \Sigma, \mu)$ finite measure space and $(f_n)_{n\in\mathbb{N}}$ is sequence in $L^p(X)$. If $f_n \to f$ uniformly on $X$, then $f \in L^p(X)$.

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Alessandro
  • 668
4 votes
2 answers
222 views

How to prove : $\{ (2+\sqrt3)^n\} = 1 -(2-\sqrt3)^n$

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fleablood
  • 134k
2 votes
0 answers
19 views

A straightforward proof of a property of lines enveloping an ellipse using complex numbers : looking for connections

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Jean Marie
  • 90.8k
2 votes
2 answers
111 views

Can I move the Lagrange multiplier to the other side?

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Rodrigo de Azevedo
  • 23.6k
2 votes
1 answer
158 views

Valence formula for level 2 modular forms

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Viktor Vaughn
  • 21.2k
2 votes
2 answers
1k views

Cauchy-Schwartz inequality in a convolution

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CommunityBot
  • 1
1 vote
0 answers
274 views

Criteria for a Regular Singular Point

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Gonçalo
  • 16.6k
0 votes
0 answers
57 views

How do I logically write the solution for a differential equation?

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Gonçalo
  • 16.6k
5 votes
1 answer
214 views

Why Bohr's definition of almost periodicity?

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The Other Terry
  • 1,999
1 vote
0 answers
25 views

Simplest Fraction in Interval

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nonhuman
  • 31
0 votes
1 answer
819 views

Prove that $A$ is not diagonalizable

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Rodrigo de Azevedo
  • 23.6k
-3 votes
1 answer
85 views

Why elements of a (Lie) algebra act on the algebra, in the adjoint representation?

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J. W. Tanner
  • 64.6k
1 vote
2 answers
461 views

Inner product and Hermitian matrices

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Rodrigo de Azevedo
  • 23.6k
4 votes
2 answers
134 views
+50

Expected number of lattice points in a randomly inscribed triangle

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Ambrose Rutherford
  • 52
6 votes
1 answer
2k views

Circle-Cirle Intersection

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CommunityBot
  • 1
1 vote
0 answers
20 views

The role of the de Rham theorem in $\nabla C^\infty(X)\cong C^\infty_0(X)$

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Nico Zimmer
  • 1,243
2 votes
1 answer
765 views

Proof of positive homogeneity of risk measure

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Rodrigo de Azevedo
  • 23.6k
1 vote
0 answers
14 views

Simplify an expression for subsequent numerical integration

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rdemo
  • 501
2 votes
0 answers
19 views

Question on Stokes phenomenon in Picard-Lefschetz theory

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schris38
  • 361
2 votes
2 answers
140 views

Robinson's word vs Rotman's word: can the second be derived from the first?

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Paul Frost
  • 92.8k
-1 votes
1 answer
26 views

Finding change of basis matrices in $\mathbb{R}^2$

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Átila Correia
  • 19.5k
4 votes
1 answer
2k views

An exercise about the regular Borel measures

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rungo
  • 19
0 votes
2 answers
308 views

how to prove: $A=B$ iff $(\forall C)~A\bigtriangleup B \subseteq C$

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ultralegend5385
  • 10.5k
4 votes
4 answers
1k views

$\gcd(a,b)=1, x^a = y^b\Rightarrow x = n^b$, $ y = n^a$ for an integer $n$.

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Bill Dubuque
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1 vote
0 answers
197 views
+50

$\Omega^1_{k[[X]]/k}$ is not finitely generated over $k[[X]]$

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Stanis LaRochelle
  • 293
1 vote
3 answers
1k views

Schlafli symbol determining number of faces

Robert Hayes's user avatar
Robert Hayes
  • 1
1 vote
2 answers
82 views

Why is $\pi_{0} \left(G \right)$ a discrete and countable Lie group

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SometimesBlind
  • 506
1 vote
2 answers
166 views

How would I reverse the order of these integrals?

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Anne Bauval
  • 51.3k
1 vote
1 answer
69 views

Any easier ways to prove an explicit form for a generated $\sigma$-algebra besides transfinite induction?

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hasManyStupidQuestions
  • 1,716
10 votes
2 answers
218 views

Polyhedron with least number of vertices whose diagonal faces enclose an interior solid region

Oscar Lanzi's user avatar
Oscar Lanzi
  • 51.4k
1 vote
1 answer
52 views

Beginning time of i-th excursions of Wiener process is a stopping time?

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John Dawkins
  • 30.3k
0 votes
1 answer
766 views

Set of vectors tangent to $f^{-1}(p) \in \mathbb{R^{n+1}}$ need not be a vector subspace of $\mathbb{R^{n+1}}$

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CommunityBot
  • 1
0 votes
0 answers
106 views

Decomposition of a Schwartz function by Lacey and Thiele

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wuentis
  • 45
2 votes
1 answer
789 views

Proof about twice differentiable function.

Paul Frost's user avatar
Paul Frost
  • 92.8k
7 votes
5 answers
714 views

Canonicity of the push-pull map for sheaves of sets

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AprilGrimoire
  • 567
1 vote
2 answers
124 views

How to decompose $Sym^n V \otimes V$, where V is some irreducible representation?

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Vladimir Lysikov
  • 5,520
11 votes
3 answers
430 views
+100

Six circles in a rectangle: show that two lengths are equal

dfnu's user avatar
dfnu
  • 8,522
4 votes
0 answers
48 views

Cycles and terminating sequences in the recurrence $N_{k+1}=N_k-\operatorname{rev}(N_k)$.

projectilemotion's user avatar
projectilemotion
  • 16k
0 votes
2 answers
49 views

Discarding absolute value symbol while solving a linear differential equation.

Artem's user avatar
Artem
  • 15.1k
13 votes
3 answers
536 views

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

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Игорь
  • 179
0 votes
1 answer
758 views

Upper and Lower Bounds Proof for Positive Functions

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CommunityBot
  • 1
3 votes
3 answers
153 views

Topologist's Comb: why can't you produce a deformation retraction to a point on one of the teeth?

freakish's user avatar
freakish
  • 47.8k
2 votes
1 answer
88 views

derivative of integral of a function with respect to the same function

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Abezhiko
  • 15.1k
2 votes
0 answers
74 views

$2^n-1$ can't be a powerful number?

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Lhachimi
  • 634
0 votes
0 answers
16 views

Generalizing the Bellissard non-commutative approach for disordered systems to Hamiltonians of self-similar fractal graphs

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ml0.0 lm
  • 1
2 votes
1 answer
61 views

Do real plane algebraic curves have a factorization corresponding to connected components?

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hbghlyj
  • 6,293
0 votes
0 answers
37 views

Localization at a prime of a subring preserves noetherianity

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Alosch
  • 131
0 votes
0 answers
65 views

Is this connection between an infinite series and OEIS A152619 known?

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Tomas Zubizarreta
  • 9
0 votes
1 answer
783 views

Outer Measure is not Finite Additive

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CommunityBot
  • 1
0 votes
2 answers
128 views

Prove $\sum \frac{x(4x-y-z)}{4x^2+(y+z)^2}\ge \frac{3}{4}$ for real variables

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River Li
  • 51.3k
0 votes
0 answers
10 views

Let $r_n$ be the least $N$ s.t. every $p^n$-th power mod $\mathfrak{m}_K^N$ lifts. Do we almost have $r_n=r_{n-1}+e$ for $e$ the ramification index?

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Jianing Song
  • 2,813
1 vote
0 answers
90 views

Can the Impossible Cube be isometrically embedded as geodesics in Nil geometry, just as the Penrose triangle is a geodesic triangle?

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hbghlyj
  • 6,293
1 vote
0 answers
28 views

Are there existing results on the number of solutions to $x^2 - y^2 = n$ in the quadratic ring $\mathbb{Z}_{m}[\sqrt D]$?

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ACBD
  • 11
0 votes
1 answer
762 views

How to express subset notation in first order set theory?

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CommunityBot
  • 1
0 votes
0 answers
9 views

Additive discrete group actions of self-Pontrjagin dual topological rings with pro-Lie stabilizer

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BertrandUtilsworth
  • 11
2 votes
2 answers
86 views

Calculation of lower branch of Lambert W-function based on root of principal branch

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njuffa
  • 2,283
0 votes
0 answers
28 views

When a cubic irrational can be written in terms of two nonnegative powers?

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mezzoctane
  • 1,770
0 votes
0 answers
47 views

A question on Remark A.1.2.8 in Higher Topos Theory

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Ben Steffan
  • 10.8k
27 votes
4 answers
7k views
+100

Prove the inequality $\frac{b+c}{a(y+z)}+\frac{c+a}{b(z+x)}+\frac{a+b}{c(x+y)}\geq \frac{3(a+b+c)}{ax+by+cz}$

River Li's user avatar
River Li
  • 51.3k
2 votes
1 answer
87 views

Simplify expression for lemniscate tangent function

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user1658693
  • 63
142 votes
30 answers
60k views

Proofs of AM-GM inequality

ecbc's user avatar
ecbc
  • 11
7 votes
5 answers
603 views

$E[X_T]$ for $T=\min\{n: \sum_{i=1}^nX_i\geq1\}$ where $X_i\sim U[0,1]$.

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Letac Gérard
  • 4,033
0 votes
1 answer
82 views
+50

Is Riemann integrability of Banach-valued functions preserved under uniform limits?

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peek-a-boo
  • 68.4k
2 votes
0 answers
13 views

Conditional convergence of uniformly integrable submartingale?

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Bart
  • 1,495
0 votes
0 answers
195 views

Deriving the formula $M= \frac {Ar(1+r)^n}{(1+r)^n-1}$ for the monthly payment $M$ of a mortgage $A$ with interest rate $r$, using $n$ payments

Blue's user avatar
Blue
  • 85.6k
4 votes
2 answers
409 views

Pigeonhole principle based measure

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RobPratt
  • 52.5k
2 votes
1 answer
86 views

No periodic orbit using Bendixon's criteria

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Gonçalo
  • 16.6k
1 vote
1 answer
76 views

Two definition of Inverse Ackermann Function

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masaki
  • 11
20 votes
3 answers
6k views

Radon-Nikodym derivative of product measure

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RobPratt
  • 52.5k
0 votes
0 answers
30 views

Structure Theorem for finitely generated modules over PID Proof

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Desperate_housewife
  • 135
2 votes
1 answer
29 views

Help understanding this Carter-Wegman proof on the lower bound of collisions in a hash family

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RobPratt
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