User J.C. Ottem - MathOverflow

J.C. Ottem

Member for 14 years, 2 months
Last seen more than 2 years ago

folk.uio.no/johnco
Cambridge

113 Answers

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7 votes

Accepted

Cone of movable curves

answered Oct 25, 2011 at 13:47

7 votes

Accepted

Geometric generic fibre

answered Jul 7, 2015 at 19:22

7 votes

Accepted

The canonical divisor of the Hilbert scheme $Hilb^n P^2$?

answered Feb 18, 2011 at 15:54

7 votes

Nonprojective Surface

answered Apr 19, 2010 at 11:02

7 votes

Accepted

Are there non-projective normal surfaces which are rational?

answered Jan 6, 2011 at 20:51

7 votes

Accepted

Should a published paper with a published correction be replaced on arXiv?

answered Dec 11, 2010 at 20:14

6 votes

Ample vector bundles on curves

answered Dec 16, 2010 at 16:42

6 votes

What is a good introductory text for moduli theory?

answered Oct 29, 2010 at 19:46

6 votes

Cohomology of Structure sheaves

answered Feb 13, 2011 at 19:22

6 votes

Which topics/problems could you show to a bright first year mathematics student?

answered Mar 12, 2011 at 11:49

6 votes

A question about an application of Molien's formula to find the generators and relations of an invariant ring

answered Mar 12, 2011 at 21:10

6 votes

Accepted

Isolated conics on a del Pezzo surface

answered May 4, 2011 at 10:35

6 votes

Reference for nef coherent sheaves?

answered Oct 12, 2011 at 11:51

6 votes

Cohomology of line bundles

answered Aug 28, 2012 at 7:58

6 votes

An example of a Calabi-Yau 3-fold with irrational nef cone?

answered May 7, 2012 at 18:58

6 votes

Accepted

Is the Segre embedding projectively normal?

answered Apr 10, 2013 at 6:45

6 votes

integral hodge classes of the Calabi-Yau 3-fold

answered Oct 24, 2012 at 17:21

5 votes

Accepted

Toric Fano manifolds with Picard number 1

answered Mar 4, 2013 at 12:10

5 votes

Picard group of a K3 surface generated by a curve

answered Mar 18, 2013 at 17:51

5 votes

Does a small contraction occur between smooth varieties?

answered Jun 14, 2012 at 11:59

5 votes

Minimal Free resolution of the ideals

answered Mar 23, 2012 at 22:22

5 votes

Bound on the (anticanonical) degree of toric Fano varieties

answered Feb 24, 2012 at 20:53

5 votes

pushforward of locally free sheaf is locally free?

answered Sep 28, 2011 at 15:51

5 votes

flatness of coherent analytic sheaf

answered May 18, 2011 at 13:01

5 votes

Looking for interesting actions that are not representations

answered Feb 22, 2011 at 18:51

5 votes

Accepted

Help with Griffiths & Harris, Surfaces

answered Nov 1, 2010 at 20:04

5 votes

When is a blow-up along a union of subvarieties smooth?

answered Nov 24, 2010 at 20:50

5 votes

The definition of "proof" throughout the history of mathematics

answered Jun 7, 2010 at 7:11

5 votes

Determine the (N-1)th fibonacci number from a given extremely large Nth ?

answered Dec 26, 2010 at 15:28

5 votes

Individual mathematical objects whose study amounts to a (sub)discipline?

answered Dec 11, 2010 at 23:44

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