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Descent in Buildings (AM-190)$
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Bernhard Mühlherr, Holger P. Petersson, and Richard M. Weiss

Print publication date: 2015

Print ISBN-13: 9780691166902

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691166902.001.0001

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The Other Bruhat-Tits Buildings

The Other Bruhat-Tits Buildings

(p.137) Chapter Eighteen The Other Bruhat-Tits Buildings
Descent in Buildings (AM-190)

Bernhard M¨uhlherr

Holger P. Petersson

Richard M. Weiss

Princeton University Press

This chapter summarizes the results about the residues of Bruhat-Tits buildings other than those associated with the exceptional Moufang quadrangles examined in previous chapters. It first considers cases, for which it assumes that Λ‎ is complete with respect to a discrete valuation in an appropriate sense. It then presents the Coxeter diagram of Ξ‎ and the vertex set S of such diagram, along with the J-residue of the building Ξ‎, which is called a gem if J is the complement in the S of a special vertex. The chapter also discusses the structure of the gems of Ξ‎ as well as cases in which the pseudo-quadratic space is defined to be ramified or unramified.

Keywords:   residue, Bruhat-Tits building, exceptional Moufang quadrangle, discrete valuation, Coxeter diagram, vertex, gem, special vertex, pseudo-quadratic space

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