Vahlen's Group of Clifford Matrices and Spin-Groups.
Vanishing of Hochschild cohomology for affine group schemes and rigidity of homomorphisms between algebraic groups.
Variations on a theme of groups splitting by a quadratic extension and Grothendieck-Serre conjecture for group schemes with trivial invariant.
Veränderungen über einen Satz von Timmesfeld – I. Quadratic Actions
We classify quadratic - and -modules by crude computation, generalising in the first case a Theorem proved independently by F.G. Timmesfeld and S. Smith. The paper is the first of a series dealing with linearisation results for abstract modules of algebraic groups and associated Lie rings.