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solbap

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Name solbap
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May
19
comment Why are affine Lie algebras called affine?
Another possibility is that the roots of an affine Lie algebra can be identified with affine linear forms on the Lie algebra of a Cartan subalgebra of the corresponding finite dimensional semisimple Lie algebra. See e.g. pg 71-72 of Loop Groups by Pressley, Segal.
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Feb
11
answered Why the Abel-Jacoby map is algebraic morphism?
Jan
31
comment Open affine subscheme of affine scheme which is not principal
@benblumsmith see Hartshorne excercise II.2.17