chernous@math.ualberta.ca; serre@dma.ens.fr

Submission: 2005, Nov 11

We provide a method for estimating lower bounds for essential dimensions of algebraic groups via orthogonal representations.

2000 Mathematics Subject Classification: 11E72, 11E04, 20G10, 20G15

Keywords and Phrases: Torsors, Essential dimension, orthogonal representations

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