Stack Exchange

Daniel Litt

New York, USA

https://www.daniellitt.com

I am a postdoc at Columbia

Email: dlitt[at]math.columbia.edu

top accounts reputation activity bookmarks subscriptions
Top Questions
105 votes

What do the stable homotopy groups of spheres say about the combinatorics of finite sets?

homotopy-theory co.combinatorics stable-homotopy symmetric-group asked Sep 27 '11 at 18:18
mathoverflow.net

61 votes

Geometric proof of the Vandermonde determinant?

linear-algebra mg.metric-geometry euclidean-geometry slick-proof lebesgue-measure asked Jun 23 '10 at 16:01
mathoverflow.net

47 votes

Uniformization over finite fields?

ag.algebraic-geometry algebraic-curves finite-fields asked May 9 '17 at 19:51
mathoverflow.net

43 votes

What is the etymology of the term “perverse sheaf”?

soft-question terminology reference-request asked Jun 29 '10 at 21:13
mathoverflow.net

37 votes

What is the shortest program for which halting is unknown?

computer-science computational-complexity reference-request asked Jun 29 '10 at 18:31
mathoverflow.net

29 votes

Making $\mathbb{Q}$-cohomology integral

ag.algebraic-geometry cohomology brauer-groups asked Oct 22 '14 at 1:53
mathoverflow.net

25 votes

Strong group ring isomorphisms

gr.group-theory ra.rings-and-algebras reference-request asked Apr 4 '11 at 21:01
mathoverflow.net

24 votes

Universal homotheties for elliptic curves

ag.algebraic-geometry nt.number-theory elliptic-curves asked Apr 22 '19 at 16:10
mathoverflow.net

21 votes

Is there a motivic Cauchy integral formula?

ag.algebraic-geometry grothendieck-rings motivic-integration asked Jun 3 '15 at 22:13
mathoverflow.net

20 votes

Semisimplicity for tensor products of representations of finite groups

ag.algebraic-geometry rt.representation-theory algebraic-groups tensor-products asked May 27 at 20:32
mathoverflow.net

1 2 3 4

Top Answers
85
Zagier's one-sentence proof of a theorem of Fermat
mathoverflow.net

74
How to picture $\mathbb{C}_p$?
mathoverflow.net

70
Should the formula for the inverse of a 2x2 matrix be obvious?
mathoverflow.net

51
Why is the fundamental group of a compact Riemann surface not free ?
mathoverflow.net

32
Motivating the Casimir element
mathoverflow.net

30
The prerequisites for Deligne's Théorie de Hodge I, II, III
mathoverflow.net

27
Elementary examples of the Weil conjectures
mathoverflow.net

26
Topos theory reference suitable for undergraduates
mathoverflow.net

25
Algebraic P vs. NP
mathoverflow.net

24
Why should curves be two-dimensional?
mathoverflow.net

24
The generalization of Brouwer's fixed point theorem?
mathoverflow.net

22
How does the Frobenius act on the prime-to-$p$ $\pi_1(\mathbb{P}^1_{\overline{\mathbb{F_p}}}\setminus \{a_1,…,a_r\})$?
mathoverflow.net

22
Are there nonisotrivial elliptic curves over $\mathbb{G}_m$?
mathoverflow.net

22
Most significant results in motivic integration theory?
mathoverflow.net

22
A set for which it is hard to determine whether or not it is countable.
mathoverflow.net

22
Can a certain sum converge to 0?
mathoverflow.net

20
Definition of area
mathoverflow.net

20
Special cases of Dirichlet's theorem
mathoverflow.net

19
Relation between $BG$ in topology and in algebraic geometry
mathoverflow.net

19
why are motives more serious than “naive” motives?
mathoverflow.net

19
Is there a non-projective flat module over a local ring?
mathoverflow.net

18
Cubic polynomial mapping primes to primes
mathoverflow.net

18
is the Hodge conjecture birationally invariant?
mathoverflow.net

18
Explicit computations of the étale homotopy type?
mathoverflow.net

18
Slick ways to make annoying verifications
mathoverflow.net

18
What elementary problems can you solve with schemes?
mathoverflow.net

18
Toy Models of Quantum Mechanics
mathoverflow.net

17
A finitely generated $\mathbb{Z}$-algebra that is a field has to be finite
mathoverflow.net

17
Liouville's theorem with your bare hands
mathoverflow.net

15
Self-intersection and the normal bundle
mathoverflow.net

1 2 3