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Questions
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How do you define the Euler Characteristic of a scheme?

aug 19 10 at 4:28 algori 16k●1●29●94

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Invariant Polynomials under a Group Action (hidden GIT)

mar 24 at 22:26 darij grinberg 12.6k●1●24●75

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Quasi-coherent sheaves in the Functor-of-points approach

mar 8 10 at 22:44 babubba 1,343●1●7●17

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The central role of varieties (a comment from Mumford’s Red Book)

feb 25 10 at 3:27 BCnrd 4,116●1●38●58

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Reference for the Frolicher-Nijenhuis Bracket

mar 5 10 at 13:14 jvkersch 817●6●11

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How is K-theory defined for coherent sheaves?

jul 26 10 at 21:02 mark 353●1●7

 
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Is there a nice way to characterise the derived equivalence induced by a flop?

apr 22 10 at 19:47 ploughshare 211●3

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Does the concept of a basis for a topology on a category exist?

jun 29 10 at 18:59 babubba 1,343●1●7●17

 
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What is the Exceptional Locus of a flopping contraction between threefolds?

oct 29 10 at 21:28 babubba 1,343●1●7●17