![Index for [italic]C*-subalgebras](https://covers.openlibrary.org/b/isbn/0821824872-M.jpg?default=false)
In this paper we study the index, denoted by Index [italic]E, for conditional expectations [italic]E on [italic]C*-algebras, which is a generalization of the index for subfactors by Jones and Kosaki. The notion of the index is related with coring structure, separable extension,…
We study the higher Frobenius-Schur indicators of modules over semisimple Hopf algebras, and relate them to other invariants as the exponent, the order, and the index. We prove various divisibility and integrality results for these invariants. In particular, we prove a version o…
"This volume is based on the author's lecture courses to algebraists at Munich and at Goteborg. He presents, for the first time in book form, a unified approach from the point of view of Frobenius algebras/extensions to diverse topics, such as Jones' subfactor theory, Hopf algeb…