User Richard Stanley

211 votes

What are the worst notations, in your opinion?

answered Mar 18, 2010 at 15:40

185 votes

Examples of eventual counterexamples

answered Jun 12, 2010 at 16:32

144 votes

Have any long-suspected irrational numbers turned out to be rational?

answered Sep 25, 2010 at 17:49

108 votes

Examples of common false beliefs in mathematics

answered Jul 8, 2010 at 0:18

105 votes

Suggestions for good notation

answered Oct 21, 2010 at 2:50

66 votes

Why were matrix determinants once such a big deal?

answered Aug 19, 2010 at 1:46

65 votes

Examples of common false beliefs in mathematics

answered Mar 5, 2011 at 23:02

62 votes

Not especially famous, long-open problems which anyone can understand

answered Jun 21, 2012 at 22:57

62 votes

Most interesting mathematics mistake?

answered Dec 24, 2009 at 18:00

60 votes

Accepted

What is the shortest program for which halting is unknown?

answered Jun 29, 2010 at 18:52

55 votes

What's your favorite equation, formula, identity or inequality?

answered Aug 21, 2010 at 2:39

55 votes

Accepted

How many surjections are there from a set of size n?

answered Jun 26, 2010 at 0:15

51 votes

Is all ordinary mathematics contained in high school mathematics?

answered Aug 24, 2010 at 23:54

51 votes

What are the external triumphs of matroid theory?

answered May 3, 2011 at 21:48

51 votes

Accepted

Why 'excedances' of permutations?

answered May 8, 2020 at 14:05

50 votes

Pseudonyms of famous mathematicians

answered Nov 7, 2010 at 20:46

49 votes

Mathematicians who were late learners?-list

answered Mar 4, 2010 at 16:50

49 votes

Not especially famous, long-open problems which anyone can understand

answered Jun 22, 2012 at 20:20

48 votes

Tweetable Mathematics

answered Apr 26, 2017 at 16:51

47 votes

Proposals for polymath projects

answered Sep 30, 2015 at 16:30

47 votes

Theorems that are 'obvious' but hard to prove

answered Jan 12, 2011 at 3:40

41 votes

Jokes in the sense of Littlewood: examples?

answered Sep 16, 2010 at 16:10

38 votes

What is Lagrange Inversion good for?

answered Jul 16, 2010 at 14:55

36 votes

What are some correct results discovered with incorrect (or no) proofs?

answered Jun 11, 2010 at 0:31

34 votes

Accepted

Partitions to different parts not exceeding $n$

answered Mar 13, 2011 at 22:34

33 votes

What are the most attractive Turing undecidable problems in mathematics?

answered Feb 15, 2010 at 2:55

33 votes

Accepted

Linear algebra proofs in combinatorics?

answered Mar 3, 2010 at 21:09

33 votes

Which polynomial's roots are its coefficients?

answered Sep 3, 2015 at 19:32

32 votes

Polynomial representing all nonnegative integers

answered Jan 9, 2010 at 19:03

31 votes

Which popular games are the most mathematical?

answered Feb 1, 2010 at 18:22

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461 Answers

What are the worst notations, in your opinion?

Examples of eventual counterexamples

Have any long-suspected irrational numbers turned out to be rational?

Examples of common false beliefs in mathematics

Suggestions for good notation

Why were matrix determinants once such a big deal?

Examples of common false beliefs in mathematics

Not especially famous, long-open problems which anyone can understand

Most interesting mathematics mistake?

What is the shortest program for which halting is unknown?

What's your favorite equation, formula, identity or inequality?

How many surjections are there from a set of size n?

Is all ordinary mathematics contained in high school mathematics?

What are the external triumphs of matroid theory?

Why 'excedances' of permutations?

Pseudonyms of famous mathematicians

Mathematicians who were late learners?-list

Not especially famous, long-open problems which anyone can understand

Tweetable Mathematics

Proposals for polymath projects

Theorems that are 'obvious' but hard to prove

Jokes in the sense of Littlewood: examples?

What is Lagrange Inversion good for?

What are some correct results discovered with incorrect (or no) proofs?

Partitions to different parts not exceeding $n$

What are the most attractive Turing undecidable problems in mathematics?

Linear algebra proofs in combinatorics?

Which polynomial's roots are its coefficients?

Polynomial representing all nonnegative integers

Which popular games are the most mathematical?