Francesco Polizzi's user avatar
Francesco Polizzi's user avatar
Francesco Polizzi's user avatar
Francesco Polizzi
  • Member for 13 years, 8 months
  • Last seen this week
79 votes
Accepted

$V$, $W$ are varieties. Does $V\times \mathbf{P}^1=W\times \mathbf{P}^1$ imply $V=W$?

68 votes

Small ideas that became big

64 votes
Accepted

Injectivity implies surjectivity

63 votes
Accepted

What group is $\langle a,b \,| \, a^2=b^2 \rangle$?

60 votes

The use of computers leading to major mathematical advances II

58 votes
Accepted

Example of 4-manifold with $\pi_1=\mathbb Q$

53 votes

17 camels trick

52 votes

Siegel zeros and other "illusory worlds": building theories around hypotheses believed to be false

51 votes

Consequences of lack of rigour

50 votes
Accepted

Do finite groups acting on a ball have a fixed point?

46 votes

When is a singular point of a variety ($\mathcal{C}^\infty$-) smooth?

45 votes

Does one real radical root imply they all are?

44 votes

Residual finiteness: why do we care?

41 votes
Accepted

What is a Lagrangian submanifold intuitively?

37 votes
Accepted

What is a square root of a line bundle?

37 votes
Accepted

Probability of generation of ${\mathbb Z}^2$

32 votes
Accepted

When is the pushforward of a vector bundle still a vector bundle?

31 votes

Non-homeomorphic spaces such that taking away a point makes them homeomorphic

31 votes

Mathematicians with both “very abstract” and “very applied” achievements

30 votes

Examples where "thin + thin = nice and thick"

30 votes
Accepted

Sheaves on Contractible Analytic Spaces

30 votes

Endless controversy about the correctness of significant papers

29 votes

Pathology in Complex Analysis

29 votes
Accepted

Why is it so hard to prove Toeplitz' conjecture?

28 votes
Accepted

Must an algebraic variety with trivial tangent bundle be an abelian variety?

27 votes

Strict applications of deformation theory in which to dip one's toe

27 votes
Accepted

Non-degenerate alternating bilinear form on a finite abelian group

26 votes

How to improve writing mathematics?

26 votes

Prominent non-mathematical work of mathematicians

25 votes

Which almost complex manifolds admit a complex structure?

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