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Justin DeVries

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What does a projective resolution mean geometrically?

ac.commutative-algebra ag.algebraic-geometry sheaf-theory derived-category

jan 29 11 at 4:15 Harry Gindi 8,948●2●33●97

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Can anyone give me a good example of two interestingly different ordinary cohomology theories?

How to think about CM rings?

A chain homotopy that does not arise from a homotopy of spaces?

Memorizing theorems

Homological algebra and calculus (as in Newton)

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homological-algebra× 2
ag.algebraic-geometry× 2
ac.commutative-algebra× 2
soft-question
sheaf-theory
homotopy-theory
derived-category
cohomology
calculus
at.algebraic-topology

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