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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 16k12994

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### Invariant Polynomials under a Group Action (hidden GIT)

mar 24 at 22:26 darij grinberg 12.6k12475

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

mar 8 10 at 22:44 babubba 1,3431717

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

feb 25 10 at 3:27 BCnrd 4,11613858

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### Reference for the Frolicher-Nijenhuis Bracket

mar 5 10 at 13:14 jvkersch 817611

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### How is K-theory defined for coherent sheaves?

jul 26 10 at 21:02 mark 35317

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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 2113

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

jun 29 10 at 18:59 babubba 1,3431717

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

oct 29 10 at 21:28 babubba 1,3431717