l-adic cohomology



Tate twist

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l-adic cohomology

attachments/Pasted%20image%2020220318193105.png attachments/Pasted%20image%2020220318193258.png

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Poincare duality: attachments/Pasted%20image%2020220207121209.png attachments/Pasted%20image%2020220207121245.png attachments/Pasted%20image%2020220207121356.png

See also weak and hard Lefschetz theorems

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Properties

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Etale cohomology

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See examples of computations of etale cohomology attachments/Pasted%20image%2020220404003555.png attachments/Pasted%20image%2020220404003623.png attachments/Pasted%20image%2020220404010433.png

Poincare duality

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Exact sequences

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A spectral sequence converging to algebraic K theory. attachments/Pasted%20image%2020220404010913.png

Excision

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amitsur complex

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Comparison

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