A generic characterization of direct summands for orthogonal involutions

Details A generic characterization of direct summands for orthogonal involutions A generic characterization of direct summands for orthogonal involutions

2006-09-05

arxiv.org/abs/math/0609139v1

Mathematics

Rings and Algebras

Scientific paper

The `transcendental methods' in the algebraic theory of quadratic forms are based on two major results, proved in the 60's by Cassels and Pfister, and known as the representation and the subform theorems. A generalization of the representation theorem was proven by Jean-Pierre Tignol in 1996, in the setting of central simple algebras with involution. This paper studies the subform question for orthogonal involutions. A generic characterization of direct summands is given; an analogue of the subform theorem is proven for division algebras and algebras of index at most 2.

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