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On induced actions of algebraic groups. (English) Zbl 0779.14015
In this paper we study the existence problem for products \(X\times_ GY\) in the categories of quasi-projective and algebraic varieties and also in the category of algebraic spaces.

14L30 Group actions on varieties or schemes (quotients)
14A20 Generalizations (algebraic spaces, stacks)
Full Text: DOI Numdam
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