Vol. 307, No. 2, 2020

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Exceptional groups of relative rank one and Galois involutions of Tits quadrangles

Bernhard Mühlherr and Richard M. Weiss

Vol. 307 (2020), No. 2, 391–454

Weshow that every Moufang set associated with one of the Tits indices 2E6,129, E7,148, E8,191 or F4,121 in arbitrary characteristic can be obtained as the fixed point building of a Galois involution acting on a Tits quadrangle parametrized by a quadrangular algebra. This result is used to calculate an explicit formula for the structure map of an arbitrary Moufang set in this class.

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building, Moufang set, Tits polygon, exceptional group
Mathematical Subject Classification 2010
Primary: 20E42, 51E12, 51E24
Received: 27 September 2019
Revised: 9 April 2020
Accepted: 26 April 2020
Published: 4 September 2020
Bernhard Mühlherr
Mathematisches Institut
Universität Giessen
Richard M. Weiss
Tufts University
Medford, MA
United States