Resumen de Cohomological invariants of quaternionic skew-hermitian forms

Grégory Berhuy

• We define a complete system of invariants e n,Q ,n = 0 for quaternionic skew-hermitian forms, which are twisted versions of the invariants e n for quadratic forms. We also show that quaternionic skew-hermitian forms defined over a field of 2-cohomological dimension at most 3 are classified by rank, discriminant, Clifford invariant and Rost invariant.