Cohomology of Quotients in Symplectic and Algebraic Geometry.

出版者:Princeton University Press

作者:Frances Clare Kirwan

页数:216

出版时间:1984-12-1

价格:USD 57.50

装帧:Paperback

isbn号码:9780691083704

These notes describe a general procedure for calculating the Betti numbers of the projective quotient varieties that geometric invariant theory associates to reductive group actions on nonsingular complex projective varieties. These quotient varieties are interesting in particular because of their relevance to moduli problems in algebraic geometry. The author describes two different approaches to the problem. One is purely algebraic, while the other uses the methods of symplectic geometry and Morse theory, and involves extending classical Morse theory to certain degenerate functions.