Automorphisms of Infinite Dimensional Algebras–Part 3

In this post we’ll show that for any algebra with a faithful ideal isomorphic to , every automorphism is inner. Buckle up; this’ll be a long one. It’ll build on my previous two posts, so make sure to read them if you haven’t already: Part 1, Part 2 Let’s gather together some facts which will […]

Automorphisms of Infinite Dimensional Algebras — Part 2

This post is devoted to determining the set of automorphisms of the Toeplitz-Jacobson -algebra . There are two general approaches to finding the automorphisms of these algebras. One could take the “outside-in” approach and look for bijective endomorphisms of . This might be an interesting approach since one can, in theory, leverage the decomposition of […]

Automorphisms of Infinite Dimensional Algebras–Part 1

I’m going to be using this, and most likely the next post or two to organize my thoughts about a fun little problem I’ve been toying around with. Recently, I’ve become interested in directly infinite algebras. Gien a field of characteristic zero , these are -algebras which have elements and such that but . Whenever […]