Dan Petersen's user avatar
Dan Petersen's user avatar
Dan Petersen's user avatar
Dan Petersen
  • Member for 14 years, 5 months
  • Last seen this week
20 votes
Accepted

Number of curves over a finite field

19 votes

Certain signed sum over $S_n$

19 votes
Accepted

A spectral sequence for computing cohomology of a space from that of its strata

19 votes

"Surprising" categorical equivalences

19 votes

German mathematical terms like "Nullstellensatz"

19 votes

Line bundle on $S^2$

19 votes

Is there an explanation of analogies between the cross-ratio and the Riemann curvature tensor?

18 votes
Accepted

Is every additive, left exact functor isomorphic to a hom functor?

18 votes
Accepted

Cohomology of configuration space as a representation of the symmetric group

17 votes

Symmetric polynoms are Hopf algebra ? What for one needs co-product ?

17 votes
Accepted

Does inclusion from n-stacks into (n+1)-stacks preserve the sheaf condition?

16 votes

Is the Euler characteristic a birational invariant

16 votes
Accepted

How universal is operadic approach to studying algebras?

16 votes
Accepted

Is it true that if $M$ is injective then $S^{-1}M$ is also injective

15 votes

Elementary / Interesting proofs of the Nullstellensatz

15 votes

Mnev's universality corollaries, quantitative versions?

15 votes
Accepted

Homotopy theories of operads

14 votes
Accepted

Invariants of higher genus curves

14 votes
Accepted

Singularities of moduli spaces of curves

14 votes

Are all parametrizations via polynomials algebraic varieties?

14 votes

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

14 votes

mixed Hodge structure of general linear group

13 votes
Accepted

Famous but unavailable paper of Jan Boman

13 votes
Accepted

Kahler manifolds and algebraic varieties

13 votes
Accepted

A non-conventional definition of topoi

13 votes
Accepted

Hecke operators acting as correspondences?

13 votes
Accepted

Is it written anywhere that open subvarieties of affine spaces have "completely impure" cohomology?

13 votes
Accepted

"Exactness" of operadic cohomology

13 votes
Accepted

Etymology of 'spectrum' in algebraic geometry and algebraic topology

12 votes

Understand the difference between two stacks

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