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math.KT2019
Decomposability of orthogonal involutions in degree 12
Anne Quéguiner-Mathieu, Jean-Pierre Tignol
A theorem of Pfister asserts that every -dimensional quadratic form with trivial discriminant and trivial Clifford invariant over a field of characteristic different from d…
math.KT2014★ 7 cited
The Arason invariant of orthogonal involutions of degree 12 and 8, and quaternionic subgroups of the Brauer group
Anne Quéguiner-Mathieu, Jean-Pierre Tignol
Using the Rost invariant for torsors under Spin groups one may define an analogue of the Arason invariant for certain hermitian forms and orthogonal involutions. We calculate this…