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

abstract-algebra group-theory finite-groups education asked Mar 21, 2011 at 17:39

math.stackexchange.com

88 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

55 votes

Rings in which every non-unit is a zero divisor

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

mathoverflow.net

51 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

40 votes

A critique of TeX?

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

tex.stackexchange.com

34 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

30 votes

Families of functions closed under integration

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

math.stackexchange.com

24 votes

Size of largest prime factor

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

math.stackexchange.com

20 votes

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

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

math.stackexchange.com

19 votes

Simple proof of the structure theorems for finite abelian groups

group-theory finite-groups abelian-groups asked May 13, 2014 at 1:24

math.stackexchange.com

Top Answers

131

Check if a file exists with Lua

stackoverflow.com

120

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

math.stackexchange.com

116

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

math.stackexchange.com

112

How do I increase sudo password remember timeout?

apple.stackexchange.com

107

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

stackoverflow.com

106

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

math.stackexchange.com

Lua print on the same line

stackoverflow.com

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

math.stackexchange.com

Elegant proofs that similar matrices have the same characteristic polynomial?

math.stackexchange.com

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

math.stackexchange.com

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

math.stackexchange.com

How do I append to a table in Lua

stackoverflow.com

How do you cleanly exit interactive Lua?

stackoverflow.com

Reading whole files in Lua

stackoverflow.com

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

math.stackexchange.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

Why is integration so much harder than differentiation?

math.stackexchange.com

lua: retrieve list of keys in a table

stackoverflow.com

What are good books to learn graph theory?

math.stackexchange.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

What does infinity in complex analysis even mean?

math.stackexchange.com

Lua's bytecode specification

stackoverflow.com

How to get an empty page with text at bottom?

stackoverflow.com

Subgroups of a cyclic group and their order.

math.stackexchange.com

A group $G$ with a subgroup $H$ of index $n$ has a normal subgroup $K\subset H$ whose index in $G$ divides $n!$

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

A ring element with a left inverse but no right inverse?

math.stackexchange.com