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Search options not deleted user 24965
9 votes
1 answer
341 views

Does $X\times Y$ have the resolution property if both $X$ and $Y$ have?

We say a complex manifold $X$ has the resolution property if every coherent sheaf $\mathcal{M}$ on $X$ admits a surjection $\mathcal{E}\twoheadrightarrow \mathcal{M}$ by some finite rank locally free …
Zhaoting Wei's user avatar
  • 9,019
4 votes
1 answer
337 views

A question on the proof of $D^b(coh(X))\simeq D^b_{coh}(Qcoh(X))$

Proposition 3.5 of "Fourier-Mukai Transforms in Algebraic Geometry" by Huybrechts claims that the is an equivalence of categories $$ D^b(coh(X))\overset{\sim}{\to} D^b_{coh}(Qcoh(X)) $$ where $D^b(coh …
Zhaoting Wei's user avatar
  • 9,019
4 votes
0 answers
194 views

Do we have $D^b_{coh}(X)\simeq D^b(coh(X))$ for a compact complex manifold $X$?

Let $X$ be a compact complex manifold and $\mathcal{O}_X$ be the structure sheaf of holomorphic functions. We call a sheaf of $\mathcal{O}_X$-module $\mathcal{F}$ coherent if it satisfies the followin …
Zhaoting Wei's user avatar
  • 9,019
13 votes
0 answers
726 views

Why do people study unbounded derived category of quasi-coherent sheaves rather than focus o...

Let $X$ be a scheme and let $D_{qoch}(X)$ and $D^b_{coh}(X)$ be the unbounded derived category of quasi-coherent sheaves and bounded derived category of coherent sheaves on $X$, respectively. $D^b_{ …
Zhaoting Wei's user avatar
  • 9,019
5 votes
1 answer
297 views

Is the dual of a compact generator also a compact generator of the derived category of a var...

Let $X$ be a variety (or more generally a quasi-compact, separated scheme) and $D(X)$ be the derived category of complexes of $\mathcal{O}_X$-modules with quasi-coherent cohomologies. Let $\mathcal{E} …
Zhaoting Wei's user avatar
  • 9,019
0 votes
0 answers
293 views

What is the support of a coherent sheaf on $X\times Y$ if it is invariant by tensoring a ver...

Let $X$ be a smooth projective variety over a field $k$ with char$k=0$ and $\mathcal{L}$ be a very ample line bundle on $X$. Let $\mathcal{F}$ be a coherent sheaf on $X$. It is well-know that if $\mat …
Zhaoting Wei's user avatar
  • 9,019