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David Rydh's user avatar
David Rydh's user avatar
David Rydh
  • Member for 15 years, 2 months
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Professor at KTH in algebraic geometry.

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answer
80
What do epimorphisms of (commutative) rings look like?
Oct 6, 2009
answer
37
When is fiber dimension upper semi-continuous?
Oct 8, 2009
answer
34
Why are unramified maps not required to be locally of finite presentation?
May 11, 2015
answer
28
Can a quotient ring R/J ever be flat over R?
Oct 9, 2009
question
25
When is an irreducible scheme quasi-compact?
Aug 5, 2010
answer
23
If the direct image of f preserves coherent sheaves on noetherian schemes, how to show f is proper?
Oct 8, 2014
answer
20
Does a scheme have a "separification"?
Oct 31, 2009
answer
18
Is there an example of a scheme X whose reduction X_red is affine but X is not affine?
Oct 5, 2009
answer
17
Do line bundles descend to coarse moduli spaces of Artin stacks with finite inertia?
May 9, 2015
answer
15
coarse moduli space of DM stacks
Feb 10, 2010