User Sameer Kailasa

18 votes

1 answer

19k views

Operator norm of orthogonal projection

asked May 16, 2014 at 22:01

17 votes

3 answers

4k views

When does $(ab)^n = a^n b^n$ imply a group is abelian?

asked Dec 5, 2014 at 16:35

17 votes

3 answers

2k views

When is the automorphism group of the Cayley graph of $G$ just $G$?

asked Jan 9, 2015 at 19:59

14 votes

2 answers

309 views

Survivor distribution following a zombie outbreak

asked Jun 5, 2019 at 20:49

13 votes

1 answer

232 views

Limiting behavior of coins on a finite graph with flips activated by a full neighborhood

asked Oct 12, 2020 at 4:56

11 votes

1 answer

349 views

Fixed-point free action of $\mathbb{Z}/p\mathbb{Z}$ on a finite CW complex

asked May 7, 2019 at 5:04

9 votes

1 answer

2k views

Show $f$ is analytic if $f^8$ is analytic

asked Jun 11, 2014 at 22:42

9 votes

1 answer

855 views

Doob-style second moment martingale inequality

asked Apr 30, 2015 at 0:45

9 votes

3 answers

905 views

Convergence of sequence: $f(n+1) = f(n) + \frac{f(n)^2}{n(n+1)}$

asked Jul 22, 2015 at 22:50

8 votes

1 answer

448 views

Minimum product of degrees of generators of finite field extension

asked Dec 30, 2016 at 4:11

8 votes

3 answers

1k views

Finitely generated ideal in Boolean ring; how do we motivate the generator?

asked Jul 25, 2014 at 14:08

7 votes

2 answers

395 views

Groups of order $8n$ have at least five distinct conjugacy classes

asked Apr 15, 2015 at 1:51

7 votes

1 answer

205 views

A number-theoretic random walk on the integers

asked May 27, 2015 at 7:30

7 votes

1 answer

162 views

If every map $X\to S^1$ is nullhomotopic, then $H_1 (X)$ is finite, without using cohomology?

asked May 6, 2019 at 17:05

6 votes

3 answers

239 views

Degree of map obtained by intersecting tangents to complex projective curve with fixed line

asked Feb 10, 2017 at 1:31

6 votes

1 answer

106 views

Robot painting a circular track

asked Mar 8, 2016 at 0:53

6 votes

1 answer

1k views

Extending isomorphism of punctured Riemann surfaces

asked Dec 6, 2017 at 16:20

6 votes

2 answers

204 views

Insertion and deletion of cubed words $w^3$

asked Apr 7, 2018 at 0:03

6 votes

3 answers

304 views

``Minimal generating ring" for a field of fractions

asked Mar 1, 2015 at 22:44

5 votes

2 answers

324 views

Nested logarithm series

asked Apr 21, 2016 at 2:38

5 votes

1 answer

132 views

Inequality in normed linear space implies independence

asked May 17, 2016 at 23:45

4 votes

0 answers

58 views

For how many residues $x\pmod{p}$ is $x^{-1} \in [1,(p-1)/2]$?

asked Jul 29, 2017 at 0:56

4 votes

1 answer

374 views

Are all connected and locally integral affine schemes globally integral?

asked Nov 27, 2017 at 15:11

4 votes

1 answer

339 views

Is every map from $\mathbb{R}P^2 \to S^2$ nullhomotopic?

asked Jan 5, 2019 at 22:50

4 votes

0 answers

59 views

Explicit polynomial over $\mathbb{F}_p$ mapping roots of irreducibles

asked Mar 6, 2017 at 19:47

4 votes

0 answers

54 views

Limit measuring failure of sum-set cancellability

asked Mar 12, 2017 at 3:13

4 votes

2 answers

1k views

How do ideal quotients behave with respect to localization?

asked Aug 10, 2015 at 18:12

4 votes

0 answers

211 views

Orbits of conjugation on matrices with fixed characteristic polynomial

asked Feb 17, 2016 at 5:51

4 votes

1 answer

276 views

Why is Minkowski's Theorem so powerful?

asked Jan 14, 2015 at 5:03

4 votes

1 answer

151 views

Elementary proof that $\sum_{j=1}^{n} \prod_{k \neq j} \frac{1}{1+(a_j - a_k + i)^2} \in \mathbb{R}$ for $a_1, \dots, a_n \in \mathbb{R}$ distinct

asked Dec 27, 2021 at 18:06

Stack Exchange Network

46 Questions

Operator norm of orthogonal projection

When does $(ab)^n = a^n b^n$ imply a group is abelian?

When is the automorphism group of the Cayley graph of $G$ just $G$?

Survivor distribution following a zombie outbreak

Limiting behavior of coins on a finite graph with flips activated by a full neighborhood

Fixed-point free action of $\mathbb{Z}/p\mathbb{Z}$ on a finite CW complex

Show $f$ is analytic if $f^8$ is analytic

Doob-style second moment martingale inequality

Convergence of sequence: $f(n+1) = f(n) + \frac{f(n)^2}{n(n+1)}$

Minimum product of degrees of generators of finite field extension

Finitely generated ideal in Boolean ring; how do we motivate the generator?

Groups of order $8n$ have at least five distinct conjugacy classes

A number-theoretic random walk on the integers

If every map $X\to S^1$ is nullhomotopic, then $H_1 (X)$ is finite, without using cohomology?

Degree of map obtained by intersecting tangents to complex projective curve with fixed line

Robot painting a circular track

Extending isomorphism of punctured Riemann surfaces

Insertion and deletion of cubed words $w^3$

``Minimal generating ring" for a field of fractions

Nested logarithm series

Inequality in normed linear space implies independence

For how many residues $x\pmod{p}$ is $x^{-1} \in [1,(p-1)/2]$?

Are all connected and locally integral affine schemes globally integral?

Is every map from $\mathbb{R}P^2 \to S^2$ nullhomotopic?

Explicit polynomial over $\mathbb{F}_p$ mapping roots of irreducibles

Limit measuring failure of sum-set cancellability

How do ideal quotients behave with respect to localization?

Orbits of conjugation on matrices with fixed characteristic polynomial

Why is Minkowski's Theorem so powerful?

Elementary proof that $\sum_{j=1}^{n} \prod_{k \neq j} \frac{1}{1+(a_j - a_k + i)^2} \in \mathbb{R}$ for $a_1, \dots, a_n \in \mathbb{R}$ distinct