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math.QA2006
Infinite index subalgebras of depth two
Lars Kadison
An algebra extension is right depth two in this paper if its tensor-square is --isomorphic to a direct summand of any (not necessarily finite) direct sum of with…
math.QA2006
Anchor maps and stable modules in depth two
Lars Kadison
An algebra extension A | B is right depth two if its tensor-square A\otimes_B A is in the Dress category Add A as A-B-bimodules. We consider necessary conditions for right, similar…
math.QA2006
Codepth Two and Related Topics
Lars Kadison
A depth two extension is shown to be weak depth two over its double centralizer if this is separable over . We consider various examples and non-examples…