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Questions
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can one define the pullback between stacks of coherent sheaves for non-flat morphisms?

sep 2 11 at 11:52 euklid345 370●1●9

 
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Is the pushforward via a proper map of a finite presentation module of finite presentation?

mar 28 12 at 17:46 a-fortiori 2,786●5●11

 
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If X -> Y -> X is the identity and Y is of finite type, can I say anything about X?

sep 14 11 at 14:37 ulrich 6,740●1●13●23

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if f is birational, is the pushforward map on the numerical groups surjective?

oct 12 11 at 14:52 Zhengyu Hu 292●1●7

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