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Is Lagrange's theorem the most basic result in finite group theory?

abstract-algebra group-theory teaching proof-strategy asked Mar 21, 2011 at 17:39

math.stackexchange.com

82 votes

Direct proof that $\pi$ is not constructible

real-analysis number-theory irrational-numbers geometric-construction asked Jan 30, 2012 at 0:08

math.stackexchange.com

45 votes

Which finite groups are the group of units of some ring?

abstract-algebra group-theory finite-groups finite-rings asked May 7, 2013 at 12:43

math.stackexchange.com

45 votes

Rings in which every non-unit is a zero divisor

ac.commutative-algebra asked Oct 18, 2010 at 14:48

mathoverflow.net

38 votes

A critique of TeX?

tex-core programming books asked Jun 4, 2012 at 14:38

tex.stackexchange.com

30 votes

Families of functions closed under integration

integration indefinite-integrals asked Aug 23, 2013 at 2:14

math.stackexchange.com

29 votes

Robust algorithm for $2 \times 2$ SVD

linear-algebra matrix reference-request svd matrix-factorization asked Oct 28, 2013 at 17:56

scicomp.stackexchange.com

23 votes

Size of largest prime factor

number-theory prime-numbers analytic-number-theory asked Apr 28, 2013 at 14:35

math.stackexchange.com

19 votes

Is the DVI format de facto dead?

microtype dvi asked Aug 28, 2013 at 15:07

tex.stackexchange.com

18 votes

Primes in $\lfloor a^{n} \rfloor$

number-theory prime-numbers asked Sep 19, 2013 at 12:42

math.stackexchange.com

Top Answers

123

Check if a file exists with Lua

stackoverflow.com

116

Is it bad form to write mysterious proofs without explaining what one intends to do?

math.stackexchange.com

105

How do I increase sudo password remember timeout?

apple.stackexchange.com

103

Every nonzero element in a finite ring is either a unit or a zero divisor

math.stackexchange.com

Continuous bijection from $(0,1)$ to $[0,1]$

math.stackexchange.com

Lua print on the same line

stackoverflow.com

How to determine if a list of polygon points are in clockwise order?

stackoverflow.com

Why “characteristic zero” and not “infinite characteristic”?

math.stackexchange.com

Proof: 1007 can not be written as the sum of two primes.

math.stackexchange.com

Why can't a set have two elements of the same value?

math.stackexchange.com

Reading whole files in Lua

stackoverflow.com

How do you cleanly exit interactive Lua?

stackoverflow.com

Why does Wolfram Alpha say the roots of a cubic involve square roots of negative numbers, when all three roots are real?

math.stackexchange.com

Is an automorphism of the field of real numbers the identity map?

math.stackexchange.com

Elegant proofs that similar matrices have the same characteristic polynomial?

math.stackexchange.com

How do I append to a table in Lua

stackoverflow.com

Why is integration so much harder than differentiation?

math.stackexchange.com

lua: retrieve list of keys in a table

stackoverflow.com

Why do we use the word "scalar" and not "number" in Linear Algebra?

math.stackexchange.com

Lua replacement for the % operator

stackoverflow.com

Which is larger? $20!$ or $2^{40}$?

math.stackexchange.com

How to get an empty page with text at bottom?

stackoverflow.com

What are good books to learn graph theory?

math.stackexchange.com

Lua's bytecode specification

stackoverflow.com

What does infinity in complex analysis even mean?

math.stackexchange.com

Really advanced techniques of integration (definite or indefinite)

math.stackexchange.com

Ring of polynomials over a field has infinitely many primes

math.stackexchange.com

Subgroups of a cyclic group and their order.

math.stackexchange.com

Mac OS X terminal delete word by word

stackoverflow.com

How do you prove that $n^n$ is $O(n!^2)$?

math.stackexchange.com