User Georges Elencwajg

170 votes

Most memorable titles

answered Oct 31, 2010 at 16:35

159 votes

What are some examples of colorful language in serious mathematics papers?

answered Apr 23, 2010 at 14:40

125 votes

How to memorise (understand) Nakayama's lemma and its corollaries?

answered Apr 12, 2011 at 21:46

114 votes

equivalence of Grothendieck-style versus Cech-style sheaf cohomology

answered Nov 5, 2009 at 8:40

110 votes

Did Bourbaki write a text on algebraic geometry?

answered Mar 20, 2015 at 9:06

105 votes

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

answered Jun 22, 2012 at 11:35

88 votes

Widely accepted mathematical results that were later shown to be wrong?

answered Aug 13, 2010 at 11:23

80 votes

Examples of conjectures that were widely believed to be true but later proved false

answered May 3, 2012 at 20:56

75 votes

Etale cohomology -- Why study it?

answered Nov 19, 2009 at 9:09

73 votes

Accepted

Cardinalities larger than the continuum in areas besides set theory

answered Nov 3, 2010 at 21:47

70 votes

What elementary problems can you solve with schemes?

answered Mar 21, 2011 at 17:33

69 votes

Accepted

Is there a compact group of countably infinite cardinality?

answered Nov 10, 2009 at 23:13

64 votes

Accepted

Kahler differentials and Ordinary Differentials

answered Nov 19, 2009 at 17:24

64 votes

Too old for advanced mathematics?

answered Nov 29, 2009 at 9:51

62 votes

How has "what every mathematician should know" changed?

answered Mar 25, 2010 at 22:11

61 votes

Intuition for Group Cohomology

answered Jan 6, 2010 at 9:46

57 votes

flatness in complex analytic geometry

answered Sep 13, 2011 at 22:21

53 votes

Pseudonyms of famous mathematicians

answered Nov 7, 2010 at 18:51

52 votes

Fundamental problems whose solution seems completely out of reach

answered Jul 1, 2012 at 8:00

49 votes

What are the open subsets of $\mathbb{R}^n$ that are diffeomorphic to $\mathbb{R}^n$

answered Nov 7, 2009 at 8:52

48 votes

Errata for Atiyah–Macdonald

answered Oct 15, 2010 at 10:50

45 votes

Accepted

What does the σ in σ-algebra stand for?

answered Aug 29, 2011 at 23:42

44 votes

Theorems that are 'obvious' but hard to prove

answered Jan 9, 2011 at 12:02

43 votes

What should be learned in a first serious schemes course?

answered Jun 17, 2010 at 22:02

43 votes

Accepted

Rank of a module

answered Jun 30, 2010 at 9:05

43 votes

Simplest examples of nonisomorphic complex algebraic varieties with isomorphic analytifications

answered Jun 21, 2011 at 19:36

42 votes

Accepted

Isomorphism between varieties of char 0

answered Aug 21, 2011 at 12:26

40 votes

Accepted

Reason for studying coherent sheaves on complex manifolds.

answered May 2, 2013 at 8:56

39 votes

lefschetz hyperplane section theorem

answered Apr 2, 2011 at 0:03

38 votes

Accepted

Justifying a theory by a seemingly unrelated example

answered Dec 13, 2009 at 12:27

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239 Answers

Most memorable titles

What are some examples of colorful language in serious mathematics papers?

How to memorise (understand) Nakayama's lemma and its corollaries?

equivalence of Grothendieck-style versus Cech-style sheaf cohomology

Did Bourbaki write a text on algebraic geometry?

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

Widely accepted mathematical results that were later shown to be wrong?

Examples of conjectures that were widely believed to be true but later proved false

Etale cohomology -- Why study it?

Cardinalities larger than the continuum in areas besides set theory

What elementary problems can you solve with schemes?

Is there a compact group of countably infinite cardinality?

Kahler differentials and Ordinary Differentials

Too old for advanced mathematics?

How has "what every mathematician should know" changed?

Intuition for Group Cohomology

flatness in complex analytic geometry

Pseudonyms of famous mathematicians

Fundamental problems whose solution seems completely out of reach

What are the open subsets of $\mathbb{R}^n$ that are diffeomorphic to $\mathbb{R}^n$

Errata for Atiyah–Macdonald

What does the σ in σ-algebra stand for?

Theorems that are 'obvious' but hard to prove

What should be learned in a first serious schemes course?

Rank of a module

Simplest examples of nonisomorphic complex algebraic varieties with isomorphic analytifications

Isomorphism between varieties of char 0

Reason for studying coherent sheaves on complex manifolds.

lefschetz hyperplane section theorem

Justifying a theory by a seemingly unrelated example