Derivation algebras of finitely generated Witt rings
Derivation algebras of finitely generated Witt rings
We consider derivations of an abstract Witt ring R. Denote the collection of derivations by Der(i?); it is a Lie algebra under the usual bracket operation.The structure of Der(JR) is closely related to the structure of the torsion part of R, which is the part least understood.After a lengthy computation …