Cayley groups |
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| Authors: | Nicole Lemire Vladimir L Popov Zinovy Reichstein |
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| Institution: | Department of Mathematics, University of Western Ontario, London, Ontario N6A 5B7, Canada ; Steklov Mathematical Institute, Russian Academy of Sciences, Gubkina 8, Moscow 119991, Russia ; Department of Mathematics, University of British Columbia, Vancouver, BC V6T 1Z2, Canada |
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| Abstract: | The classical Cayley map,  , is a birational isomorphism between the special orthogonal group SO and its Lie algebra  , which is SO -equivariant with respect to the conjugating and adjoint actions, respectively. We ask whether or not maps with these properties can be constructed for other algebraic groups. We show that the answer is usually ``no", with a few exceptions. In particular, we show that a Cayley map for the group SL exists if and only if  , answering an old question of LUNA. |
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| Keywords: | Algebraic group Lie algebra reductive group algebraic torus Weyl group root system birational isomorphism Cayley map rationality cohomology permutation lattice |
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