Andrea Ferretti's user avatar
Andrea Ferretti's user avatar
Andrea Ferretti's user avatar
Andrea Ferretti
  • Member for 14 years, 5 months
  • Last seen more than a week ago
29 votes

Interesting results in algebraic geometry accessible to 3rd year undergraduates

6 votes

Resources on invariant theory

2 votes

Ample line bundles, sections, morphisms to projective space

25 votes
Accepted

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

5 votes

Archiving mathematical correspondence

4 votes

What are the uses of the homotopy groups of spheres?

4 votes

Examples of great mathematical writing

4 votes

A problem of an infinite number of balls and an urn

161 votes

Most memorable titles

1 vote

Striking existence theorems with mild conditions, and simple to state: more recent examples?

7 votes

Proofs where higher dimension or cardinality actually enabled much simpler proof?

2 votes

Injective maps and direct limits

4 votes

Theorems first published in textbooks?

31 votes

Ways to prove the fundamental theorem of algebra

8 votes

Automatically solving olympiad geometry problems

141 votes
Accepted

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

17 votes

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

63 votes

Knuth's intuition that Goldbach might be unprovable

4 votes

A direct proof that minimal primes are associated

10 votes

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

10 votes

Why must nilpotent elements be allowed in modern algebraic geometry?

52 votes

Collecting proofs that finite multiplicative subgroups of fields are cyclic

6 votes

Identifying the orientation bundle uniquely

29 votes

Why do we care about the Hilbert scheme of points?

5 votes
Accepted

Which is the correct generalization of Euler sequence to the projectivization of a vector bundle?

2 votes
Accepted

Do all graphs of C1 functions have Hausdorff dimension 1?

11 votes

Origins of names of algebraic structures

11 votes

The definition of homotopy in algebraic topology

1 vote

Continuous + holomorphic on a dense open => holomorphic?

24 votes

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