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Results tagged with ag.algebraic-geometry
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user 59235
Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.
14
votes
3
answers
1k
views
Counterexamples to gluing complexes of sheaves
Note: I asked the question below last week on MathSE but received no answer.
Background:
I have read the claim that perverse sheaves behave more like sheaves than like complexes of sheaves. This r …
- 9,019
2
votes
0
answers
183
views
Grothendieck group of constructible sets
Let $K_0$ be the Grothendieck group of complex algebraic varieties. This is the group generated by all complex algebraic varieties, subject to the relations:
(i) $[X]=[Y]$ if $X,Y$ are isomorphic,
…
- 937
3
votes
0
answers
133
views
Two notions of a "nilpotent orbit"
I am wondering about the equivalence of two notions of a "nilpotent orbit".
The first notion, which I am familiar with, is as follows: given a lie group $G$ and a lie algebra $\frak{g}$, the orbit of …
- 937
6
votes
2
answers
1k
views
Are irreducible subgroups Zariski-dense?
A subgroup $H$ of an algebraic group $G$ is said to be Zariski-dense if its Zariski closure is all of $G$ (or alternatively, if every polynomial which vanishes on all elements of $H$ vanishes identica …
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