Yosemite Sam
  • Member for 10 years, 5 months
  • Last seen more than 3 years ago
3 answers
22 votes
3k views
14 bookmarks
how to make the category of chain complexes into an $\infty$-category
1 answers
18 votes
2k views
7 bookmarks
can a common mortal understand why the affine line is not smooth in brave new algebraic geometry?
2 answers
14 votes
2k views
5 bookmarks
what is the stringy Kähler moduli space?
1 answers
11 votes
1k views
8 bookmarks
coarse moduli space and $\pi_0$
3 answers
11 votes
1k views
2 bookmarks
Reference for the derived category of $X$, $[X/G]$ and $X/G$
1 answers
9 votes
3k views
9 bookmarks
surjective morphism of schemes or epimorphism of sheaves?
1 answers
7 votes
1k views
5 bookmarks
What is the negative cyclic homology of a smooth projective variety?
0 answers
5 votes
206 views
Description of flop as graded algebra
1 answers
5 votes
610 views
Resolutions by free Differential Graded Algebras
1 answers
4 votes
570 views
4 bookmarks
Colimits in colimits of categories
0 answers
4 votes
414 views
1 bookmarks
where to learn K-group of coherent sheaves modulo numerical equivalence?
2 answers
4 votes
677 views
If $f: X \to Y$ is a finite flat morphism of schemes, $g: Y \to Z$ is a proper morphism of relative dimension one, $Z$ is affine and $E$ is a vector bundle on $Y$ with $R^1g_*E=0$ then $H^1(X,f^*E)=0$?
1 answers
4 votes
393 views
2 bookmarks
can one define the pullback between stacks of coherent sheaves for non-flat morphisms?
1 answers
3 votes
267 views
uniqueness of uniformizers
2 answers
3 votes
1k views
3 bookmarks
if f is birational, is the pushforward map on the numerical groups surjective?
1 answers
2 votes
280 views
1 bookmarks
If tensor product has finite length, do higher Tors also have finite length?
0 answers
2 votes
248 views
Can I recognize the quotient of a group by a closed subgroup? (for example the standard representation of S3 in GL(2,C))
1 answers
2 votes
276 views
Is the pushforward via a proper map of a finite presentation module of finite presentation?
1 answers
2 votes
577 views
Does Hom(X,Spec R) = Hom(R, O(X)) hold for algebraic stacks?
1 answers
1 votes
244 views
If X -> Y -> X is the identity and Y is of finite type, can I say anything about X?
0 answers
0 votes
111 views
1 bookmarks
Books on algebraic groups over C with examples