On the norm principle for quadratic forms
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We prove a version of Knebusch's Norm Principle for finite étale extensions of semi-local Noetherian domains with infinite residue fields of characteristic different from 2. As an application we prove Grothendieck's conjecture on principal homogeneous spaces for the spinor group of a quadratic space.
14 pages, hyperref, xypic, (This is an extended and revised version of the previous preprint: The proof of Grothendieck's conjecture on Principal Homogeneous Spaces for the case of spinor group was added)
14 pages, hyperref, xypic, (This is an extended and revised version of the previous preprint: The proof of Grothendieck's conjecture on Principal Homogeneous Spaces for the case of spinor group was added)