Thomas Browning

Member for 7 years, 4 months
Last seen this week

Berkeley, CA, United States

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group-theory

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Questions

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Score Activity Newest Views

53

Bijection $f\colon\mathbb{N}\to\mathbb{N}$ with $f(0)=0$ and $|f(n)-f(n-1)|=n$

Jun 21, 2018

28

Is $\sum_{a=0}^m\sum_{b=0}^n\cos(abx)$ always positive?

Oct 18, 2021

24

Abstract proof that $\lvert H^2(G,A)\rvert$ counts group extensions.

Apr 30, 2019

23

Maximal subgroups that force solvability.

Sep 21, 2018

22

Probability of random sphere lying inside the unit ball

Feb 22, 2020

Answers

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Score Activity Newest

11

How to compute $\sum_{k=1}^{\infty}{\frac{1}{k^2+2k}}$?

Jun 16, 2019

10

Let G be a group of order $pqr$,where $p<q<r$ are primes. Prove that the Sylow r-group is normal.

Jul 20, 2019

8

$3^n$ does not divide $4^n+5$ for $n\geq 2$

Apr 21, 2020

7

Is $S$ is open in $\mathbb{R}^2$?

Jul 2, 2019

7

If $I\cong G/H$, where $I$ is a subgroup of $G$, why is $G=IH$?

Dec 9, 2019

Tags

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group-theory

46

Score

35

posts

abstract-algebra

30

Score

13

posts

finite-groups

19

Score

19

posts

real-analysis

19

Score

5

posts

sylow-theory

16

Score

6

posts

Reputation

+10

When is the compact-open topology locally compact?

+10

Show that a finite abelian group is cyclic if and only if every Sylow-p-subgroups are cyclic.

+10

How big must the union of a group's Sylow p-subgroups be?

+10

Growth of powers of symmetric subsets in a finite group

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