Abstract
We obtain a criterion for rational smoothness of an algebraic variety with a torus action, with applications to orbit closures in flag varieties, and to closures of double classes in regular group completions.
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Dedicated to the memory of Claude Chevalley
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Brion, M. Rational smoothness and fixed points of torus actions. Transformation Groups 4, 127–156 (1999). https://doi.org/10.1007/BF01237356
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DOI: https://doi.org/10.1007/BF01237356