Mathematics – Complex Variables
Scientific paper
2009-06-25
Ann. Scuola Norm. Sup. Pisa Cl. Sci. (5), Vol. X, issue 2 (2011), 413-426
Mathematics
Complex Variables
13 pages; typos corrected, references added and updated; to appear in Annali della Scuola Normale Superiore, Classe di Scienze
Scientific paper
We prove that rational and 1-rational singularities of complex spaces are stable under taking quotients by holomorphic actions of reductive and compact Lie groups. This extends a result of Boutot to the analytic category and yields a refinement of his result in the algebraic category. As one of the main technical tools vanishing theorems for cohomology groups with support on fibres of resolutions are proven.
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