User Daniel Litt

99 votes

Accepted

Zagier's one-sentence proof of a theorem of Fermat

answered Jul 8, 2010 at 21:25

90 votes

How to picture $\mathbb{C}_p$?

answered Jan 13, 2011 at 4:41

83 votes

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Should the formula for the inverse of a 2x2 matrix be obvious?

answered Feb 21, 2012 at 2:58

60 votes

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Why is the fundamental group of a compact Riemann surface not free ?

answered Apr 6, 2012 at 16:51

37 votes

Motivating the Casimir element

answered Dec 13, 2013 at 7:47

33 votes

Accepted

The prerequisites for Deligne's Théorie de Hodge I, II, III

answered Sep 4, 2013 at 0:58

31 votes

Topos theory reference suitable for undergraduates

answered Feb 18, 2011 at 20:20

29 votes

Elementary examples of the Weil conjectures

answered Jan 2, 2013 at 21:42

29 votes

is the Hodge conjecture birationally invariant?

answered Nov 8, 2014 at 6:04

28 votes

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Algebraic P vs. NP

answered Mar 8, 2011 at 1:18

26 votes

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Why should curves be two-dimensional?

answered Oct 12, 2015 at 19:03

25 votes

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The generalization of Brouwer's fixed point theorem?

answered Mar 28, 2011 at 4:34

23 votes

A set for which it is hard to determine whether or not it is countable.

answered Mar 22, 2011 at 3:30

23 votes

How does the Frobenius act on the prime-to-$p$ $\pi_1(\mathbb{P}^1_{\overline{\mathbb{F_p}}}\setminus \{a_1,...,a_r\})$?

answered Feb 6, 2019 at 15:23

23 votes

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Are there nonisotrivial elliptic curves over $\mathbb{G}_m$?

answered Dec 12, 2014 at 5:54

22 votes

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Most significant results in motivic integration theory?

answered Sep 1, 2013 at 4:50

22 votes

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Can a certain sum converge to 0?

answered Apr 5, 2011 at 0:19

22 votes

What elementary problems can you solve with schemes?

answered Mar 21, 2011 at 20:59

22 votes

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Special cases of Dirichlet's theorem

answered Jul 20, 2010 at 13:31

21 votes

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Relation between $BG$ in topology and in algebraic geometry

answered Nov 18, 2014 at 2:20

20 votes

why are motives more serious than "naive" motives?

answered Nov 7, 2014 at 3:02

20 votes

Accepted

Is there a non-projective flat module over a local ring?

answered Jul 21, 2010 at 21:32

20 votes

Definition of area

answered Jan 26, 2013 at 18:40

20 votes

Elementary results with p-adic numbers

answered Nov 19, 2011 at 17:22

19 votes

Explicit computations of the étale homotopy type?

answered Jan 8, 2013 at 5:37

19 votes

A finitely generated $\mathbb{Z}$-algebra that is a field has to be finite

answered Mar 6, 2011 at 0:08

18 votes

Toy Models of Quantum Mechanics

answered Mar 20, 2011 at 6:25

18 votes

Accepted

Cubic polynomial mapping primes to primes

answered May 5, 2011 at 2:40

18 votes

Serre's Analogue of the Weil Conjectures for Non-Compact Kahler Manifolds

answered Dec 20, 2012 at 1:01

18 votes

Liouville's theorem with your bare hands

answered Dec 20, 2012 at 20:33

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134 Answers

Zagier's one-sentence proof of a theorem of Fermat

How to picture $\mathbb{C}_p$?

Should the formula for the inverse of a 2x2 matrix be obvious?

Why is the fundamental group of a compact Riemann surface not free ?

Motivating the Casimir element

The prerequisites for Deligne's Théorie de Hodge I, II, III

Topos theory reference suitable for undergraduates

Elementary examples of the Weil conjectures

is the Hodge conjecture birationally invariant?

Algebraic P vs. NP

Why should curves be two-dimensional?

The generalization of Brouwer's fixed point theorem?

A set for which it is hard to determine whether or not it is countable.

How does the Frobenius act on the prime-to-$p$ $\pi_1(\mathbb{P}^1_{\overline{\mathbb{F_p}}}\setminus \{a_1,...,a_r\})$?

Are there nonisotrivial elliptic curves over $\mathbb{G}_m$?

Most significant results in motivic integration theory?

Can a certain sum converge to 0?

What elementary problems can you solve with schemes?

Special cases of Dirichlet's theorem

Relation between $BG$ in topology and in algebraic geometry

why are motives more serious than "naive" motives?

Is there a non-projective flat module over a local ring?

Definition of area

Elementary results with p-adic numbers

Explicit computations of the étale homotopy type?

A finitely generated $\mathbb{Z}$-algebra that is a field has to be finite

Toy Models of Quantum Mechanics

Cubic polynomial mapping primes to primes

Serre's Analogue of the Weil Conjectures for Non-Compact Kahler Manifolds

Liouville's theorem with your bare hands