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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

1 vote

Familiar equations in more general settings

The equation for the variance of a sum of correlated random variables looks like the law of cosines. More on that here. Both the variance formula and the law of cosines are consequences of general pro …
John D. Cook's user avatar
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15 votes

Best algebraic geometry textbook? (other than Hartshorne)

Joe Harris's book Algebraic Geometry might be a good warm-up to Hartshorne.