User Jason Starr - MathOverflow

Jason Starr

Member for 14 years, 6 months
Last seen this week

math.sunysb.edu/~jstarr/…
Stony Brook University, Stony Brook, NY USA

679 Answers

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9 votes

Accepted

Can the homological dimension of a coherent sheaf explode along a formal deformation? (is the resolution property hereditary for formal deformations?)

answered May 15, 2017 at 3:55

9 votes

Accepted

Push-forward of a quasi-coherent graded algebra under a proper map

answered Dec 13, 2014 at 22:20

9 votes

Accepted

Fano variety of lines on the Segre and the Grassmannian

answered Dec 15, 2014 at 2:35

9 votes

Accepted

Is there a topological Chevalley-Shephard-Todd Theorem?

answered Jul 20, 2015 at 14:14

9 votes

Accepted

The topology of Fano schemes of lines

answered Apr 27, 2015 at 12:57

9 votes

Accepted

Are essentially smooth schemes noetherian?

answered May 5, 2015 at 11:04

9 votes

Reduced special fiber implies reduced generic fiber for a projective morphism?

answered Nov 10, 2013 at 21:58

9 votes

Can you form the "spectrum" of a sheaf of algebras?

answered Nov 15, 2013 at 13:48

9 votes

Accepted

Does finite+reduced fibers+connected fibers imply isomorphism?

answered Nov 24, 2012 at 23:39

9 votes

Accepted

Examples of nice reduced singularities on Hilbert schemes--Edited

answered Aug 2, 2012 at 17:52

9 votes

Accepted

Hasse principle for high dimensional varieties

answered Aug 20, 2012 at 16:34

9 votes

Partial (or complete) flag varieties as GIT quotients of affine spaces

answered Aug 21, 2013 at 11:21

9 votes

Automorphisms of $SL_n$ as a variety

answered Jan 15, 2013 at 18:41

8 votes

Does this quadratic form over a large field represent 1?

answered Aug 31, 2013 at 16:38

8 votes

index one Fano manifold

answered Sep 16, 2013 at 13:03

8 votes

Accepted

Modern Proof of the Theorem of the Base

answered Jul 31, 2012 at 21:58

8 votes

Accepted

Monodromy of covering map related to symmetric group

answered Jul 5, 2012 at 13:34

8 votes

Accepted

lifting morphism of torsors

answered Jul 6, 2012 at 13:18

8 votes

Rationally connected varieties and rational fibrations

answered Oct 16, 2013 at 16:04

8 votes

Accepted

Invariants of the maximal unipotent subgroup of GL(n) acting on the space of n by n matrices

answered Jul 24, 2015 at 1:44

8 votes

Hypersurfaces with rational self-maps

answered Jul 30, 2014 at 13:10

8 votes

To derive or not to derive, that is the question

answered Apr 15, 2017 at 11:58

8 votes

Accepted

Do the cohomology groups of the structure sheaf of a smooth resolution depend on the resolution?

answered Aug 22, 2017 at 13:28

8 votes

Accepted

Is a cubic hypersurface determined by its Fano variety of lines?

answered Mar 4, 2018 at 17:00

8 votes

Exercise 1.1.(c) in Hartshorne's Deformation Theory

answered Feb 9, 2018 at 17:19

8 votes

Pushing-forward morphisms

answered Dec 3, 2015 at 12:34

8 votes

Quotient of a smooth curve by a finite group and differentials

answered Dec 24, 2015 at 16:17

8 votes

Accepted

The class of the diagonal in the symmetric product of a smooth curve

answered Mar 30, 2016 at 13:07

8 votes

Accepted

Irreducible representations of $SL_n \mathbb Z$

answered Aug 5, 2016 at 13:28

8 votes

Accepted

Is the map on étale fundamental groups of a quasi-projective variety, upon base change between algebraically closed fields, an isomorphism?

answered Dec 21, 2016 at 13:12

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