, Volume 27, Issue 3, pp 165-189

Versal deformations and algebraic stacks

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This paper was written while the author visited the Tata Institute of Fundamental Research in Bombay, and the Research Institute for Mathematical Sciences of Kyoto University. We want to thank these institutions for their generous hospitality and support. We also want to thank R. Elkik and L. Illusie for some helpful discussions.