Sean Eberhard

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bio	website	seaneberhard.blogspot.co.uk
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He's just this guy, you know.

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66 Answers

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19	If $a^2$ divides $b^2$, then $a$ divides $b$
12	Seating of $n$ people with tickets into $n+k$ chairs with 1st person taking a random seat
8	Prove that for any element $b$, $\|b\|$ divides $\|a\|$ (order of $b$ divides order of $a$).
7	Why is the quotient map $SL_n(\mathbb{Z})$ to $SL_n(\mathbb{Z}/p\mathbb Z)$ is surjective?
7	infinity sum of numbers

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2,709 Reputation

+10	How to prove that if convex $A \subset \mathbb{R}^n$ and $A+A=A$ then $0 \in cl(A)$?
+10	Combinatorics: How to find the number of sets of numbers in increasing order?
+20	Prove that for any element $b$, $\|b\|$ divides $\|a\|$ (order of $b$ divides order of $a$).
+10	If a finite translation of $A$ covers an abelian group, infinite translations of it intersect.

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6 Questions

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7	Continuous Brouwer's fixed point theorem via Stokes's theorem?
6	What does the Haar measure on $\hat{\mathbf{Z}}$ look like?
4	Lower central series of a free group
3	Must a surjection $F_2\to F_2$ also be an injection?
3	Harmonic functions on $\mathbf{Z}^2$

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75 Tags

35 homework × 7	19 divisibility
26 elementary-number-theory × 3	18 real-analysis × 7
22 group-theory × 8	18 abstract-algebra × 4
21 combinatorics × 8	11 sequences-and-series × 3
19 probability × 2	11 algebra-precalculus × 2

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4 Accounts

$Mathematics Stack Exchange$	Mathematics	2,709 rep	215
	Stack Overflow	101 rep	1
	Seasoned Advice	101 rep	1
	English Language & Usage	101 rep	1

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178 Votes Cast

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