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user41650
  • Member for 10 years, 5 months
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16 votes
2 answers
3k views

If the direct image of f preserves coherent sheaves on noetherian schemes, how to show f is proper?

12 votes
1 answer
528 views

Embedding of a derived category into another derived category

11 votes
2 answers
1k views

Does vanishing of cohomology of locally free sheaves imply affiness of scheme

8 votes
1 answer
313 views

rational effective implies effective?

8 votes
2 answers
634 views

How to compute the periodic cyclic homology of this algebra

7 votes
2 answers
1k views

How to characterize flasque sheaves in more functorial way?

5 votes
0 answers
414 views

Reconstruction of noncommutative scheme

5 votes
0 answers
254 views

How to prove a statement on weak del pezzo surface?

4 votes
0 answers
588 views

Euler characteristic, character of group representation and Riemann Roch theorem

4 votes
0 answers
332 views

Categorical proof for Chavelley theorem on affiness of scheme

4 votes
1 answer
581 views

On non-unital ring and algebraic geometry

4 votes
1 answer
296 views

Auto-equivalences of non-trivial components of derived category of $X_{18}$

3 votes
0 answers
385 views

What is the most useful rationality criterion of surfaces?

3 votes
0 answers
301 views

Are two versions of Kuznetsov components equivalent?

3 votes
2 answers
1k views

Homological smoothness implies projectivity?

3 votes
1 answer
177 views

Intersection graph of $(-1)$-class divisors on surface of general type

3 votes
0 answers
133 views

How to distinguish the singularities on moduli space?

3 votes
1 answer
179 views

Semi-orthogonal decomposition for maximally non-factorial Fano threefolds

3 votes
1 answer
280 views

Automorphism of moduli space of stable vector bundles over a curve

2 votes
0 answers
153 views

Non-triviality of a morphism

2 votes
0 answers
69 views

What is happening on the second step of left mutation?

2 votes
0 answers
218 views

Fibers of period map

2 votes
0 answers
159 views

Conics on Gushel-Mukai fourfold

2 votes
0 answers
147 views

Normal bundle of a Fano threefold as Brill-Noether loci

2 votes
1 answer
172 views

liftability of isomorphism of curves in $P^3$

2 votes
0 answers
35 views

Torelli theorem for veronese double cone(reference needed)

2 votes
1 answer
172 views

Perfect complexes of plane nodal cubic curve

2 votes
0 answers
90 views

Cone of morphism in families

2 votes
0 answers
153 views

Euler form on three-fold

2 votes
2 answers
232 views

Effectivity of $(-1)$-class on smooth projective surface