Some reductive anisotropic groups that admit no non-trivial split spherical BN-pairs

Details Some reductive anisotropic groups that admit no non-trivial split spherical BN-pairs Some reductive anisotropic groups that admit no non-trivial split spherical BN-pairs

2011-08-24

arxiv.org/abs/1108.4913v1

Mathematics

Group Theory

11 pages, 1 figure

Scientific paper

We prove, for any infinite field k, that any virtually trivial split spherical BN-pair in the group G(k) of k-rational points of a reductive k-group G is already trivial. We then inspect the case when G is k-anisotropic and show that in many situations G(k) admits no non-trivial split spherical BN-pairs. This improves results and contributes to a conjecture of Caprace and Marquis, which can be viewed as a converse to a well-known result of Borel and Tits.

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