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Interesting 50 Bountied Hot Week Month
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0 answers
17 views

A smooth function

KReiser
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2 votes
0 answers
11 views

Prove that differential equations are right continuous with respect to initial values.

Arctic Char
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1 vote
1 answer
35 views

Closed form solution $\sum\limits_{n=1}^{\infty}\frac{\left(-1\right)^{n}}{H_n}$

Gary
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1 vote
2 answers
27 views

Proof that $\overline A= Int(A) \cup \partial (A)$

Átila Correia
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0 votes
1 answer
33 views

Epsilon-Delta issues

ConMan
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0 votes
1 answer
28 views

s-Lipschitz continuity and constant functions

RobPratt
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0 votes
0 answers
26 views

Quick question about a counterexample to an exercise in group theory

Deeponjit Bose
  • 180
2 votes
0 answers
24 views

Prove that if $p$ is a prime such that $p>3$, then $ab^p - ba^p$ is divisible by $6p$

tjblue
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-2 votes
0 answers
21 views

Epsilon-delta continuity for multi-variable natural log function

RobPratt
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0 votes
0 answers
21 views

Simplify $4(ab+cd)^2-(a^2+b^2-c^2-d^2)^2$

ronald christenkkson
  • 481
0 votes
0 answers
19 views

Name for point in space which is contained in all nonempty open sets?

bof
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0 votes
0 answers
17 views

Using field axioms to prove the next

juank2016
  • 69
1 vote
1 answer
12 views

Example of two real monic polynomials with roots contained in the unit disk, with a convex combination of the two having a root outside the unit disk

dxiv
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1 vote
0 answers
15 views

Are there any simpler methods or closed forms for $ \int_0^{\frac{\pi}{2}} \frac{x^n}{\sin x} d x$?

Lai
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2 votes
0 answers
14 views

Proof explanation: Every closed subset is a boundary

Math23
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0 votes
0 answers
13 views

Out-of-distribution Slepian-Wolf coding

Robert Obryk
  • 101
0 votes
0 answers
12 views

Isomorphism of lexicograpical order

Math student
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0 votes
0 answers
12 views

For $f \in K[x_0,\ldots,x_n]$ then, $(\phi_i^{-1})^*(\phi_i^*(f)) | f$

George
  • 447
0 votes
0 answers
12 views

differential equation system of a function sequence

Halk
  • 75
0 votes
0 answers
12 views

What are some good algebraic manipulation workbooks for beginners?

user1161534
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0 votes
0 answers
11 views

Biased random walk - stationary distribution

RobPratt
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1 vote
1 answer
27 views

Can any repeating sequence be expressed in a generating function?

A016090
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0 votes
1 answer
41 views

What is the value of the series $\displaystyle \sum_{n=1}^{\infty} \dfrac{1}{3n^2-n}$? [closed]

Leucippus
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1 vote
1 answer
24 views

Theorems (or references to analysis) of a particular Hilbert-deductive-system using $\\{\neg, \wedge, \vee, \rightarrow\\}$ as primitive symbols?

Bram28
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0 votes
1 answer
24 views

If x-axis is a tangent to a curve, show that it is also a tangent to another curve.

SundayLi
  • 182
1 vote
0 answers
24 views

Upper-bounds on a sequence given its generating function?

Yaroslav Bulatov
  • 4,585
1 vote
0 answers
44 views

The quote of von Neumann

Abdelrahman
  • 390
-1 votes
1 answer
33 views

Use the ratio test to determine if the following series converges or diverges: $\sum_{k\geq 1}\frac{k!}{k^{k}}$

GEdgar
  • 102k
1 vote
1 answer
39 views

To prove Stokes's theorem, why does it suffice to prove it for $\mathbb{R}^n$ and for $\mathcal{H}^n$?

Arctic Char
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0 votes
3 answers
70 views

What's the number of solutions for $x_1 + x_2 + x_3 + ... + x_k = n$ where $x_i \neq x_j$, for all $i, j \in {1\dots k}$

TurlocTheRed
  • 3,377
0 votes
1 answer
26 views

Eigenvalue Localization

gandalfbalrogslayer
  • 156
0 votes
0 answers
22 views

A simple question about partial differential equations.

shi guoxu
  • 1
0 votes
1 answer
22 views

Prove that $A_i$ has at least $1$ member that is not colored.

RobPratt
  • 39.7k
0 votes
0 answers
17 views

How to calculate species density from a given equation?

Mohammed Niyasdeen
  • 1
0 votes
0 answers
49 views

Use the squeeze theorem to find $\lim_{(x,y)\to(0,0)}\frac{x^3 - y^3}{x^2 + y^2}$

Átila Correia
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1 vote
1 answer
75 views

If $f$ is odd and strictly decreasing prove $f^{-1}(x)=f(x) \Leftrightarrow f(x)=x \Leftrightarrow f^{-1}(x)=x$.

Mike
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-2 votes
0 answers
43 views

Limit of $\sqrt x$ as $x$ approaches $-1$

Julius Kulla
  • 9
2 votes
1 answer
33 views

Which base to use when taking log of both sides in an inequality?

user24096
  • 420
0 votes
0 answers
38 views

Is $\{(z_1,z_2) \in \mathbb{C}^2 :|z_1|=|z_2| = 1, z_1^m = z_2^n\}$ a circle?

Zorngo
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0 votes
0 answers
14 views

Hausdorff dimension of the Koch curve

Arctic Char
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0 votes
0 answers
14 views

Spanning trees and integer partitions

RobPratt
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0 votes
0 answers
14 views

Why are we looking for the lowest rank matrix in matrix completion tasks?

Cedric Martens
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0 votes
0 answers
28 views

Projection of finite dimensional space with ell infinity norm

Iamastudent
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0 votes
1 answer
19 views

Define a grammar for language $L = \{a^{n}b^{*}c^{2n+1} \}$

amitb03
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0 votes
1 answer
45 views

How to use Lagrange multipliers if the constraint is given as the expectation of a dataset

A rural reader
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3 votes
2 answers
47 views

Expanding Arcus Tangens as Taylor Series around 1: Symmetries

joriki
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0 votes
0 answers
22 views

Expected time between events

user788466
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