Isotropy of unitary involutions |
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Authors: | Nikita Karpenko Maksim Zhykhovich |
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Affiliation: | 1. Department of Mathematical and Statistical Sciences, University of Alberta, 632 Central Academic Building, Edmonton, AB, T6G 2G1, Canada 2. Johannes Gutenberg-Universit?t, Institut für Mathematik, Staudingerweg 9, DE-55099, Mainz, Germany
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Abstract: | We prove the so-called unitary isotropy theorem, a result on isotropy of a unitary involution. The analogous previously known results on isotropy of orthogonal and symplectic involutions as well as on hyperbolicity of orthogonal, symplectic, and unitary involutions are formal consequences of this theorem. A component of the proof is a detailed study of the quasi-split unitary grassmannians. |
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