User Andrea Ferretti

161 votes

Most memorable titles

answered Oct 31, 2010 at 14:30

141 votes

Accepted

Slick proof?: A vector space has the same dimension as its dual if and only if it is finite dimensional

answered Jan 29, 2010 at 12:45

63 votes

Knuth's intuition that Goldbach might be unprovable

answered Jun 11, 2010 at 0:50

52 votes

Collecting proofs that finite multiplicative subgroups of fields are cyclic

answered Feb 8, 2011 at 9:45

31 votes

Ways to prove the fundamental theorem of algebra

answered Jan 4, 2010 at 14:57

29 votes

Interesting results in algebraic geometry accessible to 3rd year undergraduates

answered Apr 3, 2010 at 20:26

29 votes

Why do we care about the Hilbert scheme of points?

answered Sep 27, 2010 at 16:04

27 votes

What is the Cayley projective plane?

answered Nov 24, 2009 at 10:23

25 votes

Accepted

Examples of the moduli space of X giving facts about a certain X

answered May 27, 2010 at 8:33

24 votes

Is there a Whitney Embedding Theorem for non-smooth manifolds?

answered Aug 5, 2010 at 17:28

24 votes

What are your favorite instructional counterexamples?

answered Mar 2, 2010 at 13:16

22 votes

Accepted

When do divisors pull back?

answered Mar 16, 2010 at 21:25

22 votes

Accepted

Integer points (very naive question)

answered Mar 19, 2010 at 15:08

20 votes

Pedagogical question about linear algebra

answered May 27, 2010 at 22:49

19 votes

Accepted

Is Hartshorne's definition of the category of varieties natural?

answered Jul 7, 2010 at 16:48

17 votes

What is the exact statement of "there are 27 lines on a cubic"?

answered Nov 25, 2009 at 9:58

16 votes

What are your favorite instructional counterexamples?

answered Mar 2, 2010 at 13:21

16 votes

If $f$ is infinitely differentiable then $f$ coincides with a polynomial

answered Aug 1, 2010 at 1:55

15 votes

Accepted

Hodge Index theorem for Complex Manifolds

answered Jan 29, 2010 at 0:51

15 votes

blowing up, -1 curves, effective and ample divisors

answered Mar 1, 2010 at 23:37

13 votes

Is a 'generic' variety nonsingular? Or singular?

answered Mar 7, 2010 at 16:35

13 votes

Examples of common false beliefs in mathematics

answered May 4, 2010 at 23:02

12 votes

Free, high quality mathematical writing online?

answered Feb 18, 2010 at 13:34

11 votes

The definition of homotopy in algebraic topology

answered Aug 11, 2010 at 17:28

11 votes

Origins of names of algebraic structures

answered Aug 12, 2010 at 1:29

10 votes

Why must nilpotent elements be allowed in modern algebraic geometry?

answered Feb 12, 2011 at 23:58

10 votes

How to determine the homotopy groups of the suspension of a space?

answered Oct 23, 2009 at 12:19

9 votes

K3 surface of genus 8

answered Feb 10, 2010 at 14:54

8 votes

What are examples of mathematical concepts named after the wrong people? (Stigler's law)

answered May 10, 2010 at 19:18

8 votes

Automatically solving olympiad geometry problems

answered Aug 7, 2019 at 9:01

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71 Answers

Most memorable titles

Slick proof?: A vector space has the same dimension as its dual if and only if it is finite dimensional

Knuth's intuition that Goldbach might be unprovable

Collecting proofs that finite multiplicative subgroups of fields are cyclic

Ways to prove the fundamental theorem of algebra

Interesting results in algebraic geometry accessible to 3rd year undergraduates

Why do we care about the Hilbert scheme of points?

What is the Cayley projective plane?

Examples of the moduli space of X giving facts about a certain X

Is there a Whitney Embedding Theorem for non-smooth manifolds?

What are your favorite instructional counterexamples?

When do divisors pull back?

Integer points (very naive question)

Pedagogical question about linear algebra

Is Hartshorne's definition of the category of varieties natural?

What is the exact statement of "there are 27 lines on a cubic"?

What are your favorite instructional counterexamples?

If $f$ is infinitely differentiable then $f$ coincides with a polynomial

Hodge Index theorem for Complex Manifolds

blowing up, -1 curves, effective and ample divisors

Is a 'generic' variety nonsingular? Or singular?

Examples of common false beliefs in mathematics

Free, high quality mathematical writing online?

The definition of homotopy in algebraic topology

Origins of names of algebraic structures

Why must nilpotent elements be allowed in modern algebraic geometry?

How to determine the homotopy groups of the suspension of a space?

K3 surface of genus 8

What are examples of mathematical concepts named after the wrong people? (Stigler's law)

Automatically solving olympiad geometry problems