1. Morita equivalence for operator systems
- Author
-
Eleftherakis, George K., Kakariadis, Evgenios T. A., and Todorov, Ivan G.
- Subjects
Mathematics - Operator Algebras ,47L25, 46L07 - Abstract
We define $\Delta$-equivalence for operator systems and show that it is identical to stable isomorphism. We define $\Delta$-contexts and bihomomorphism contexts and show that two operator systems are $\Delta$-equivalent if and only if they can be placed in a $\Delta$-context, equivalently, in a bihomomorphism context. We show that nuclearity for a variety of tensor products is an invariant for $\Delta$-equivalence and that function systems are $\Delta$-equivalent precisely when they are order isomorphic. We prove that $\Delta$-equivalent operator systems have equivalent categories of representations. As an application, we characterise $\Delta$-equivalence of graph operator systems in combinatorial terms. We examine a notion of Morita embedding for operator systems, showing that mutually $\Delta$-embeddable operator systems have orthogonally complemented $\Delta$-equivalent corners., Comment: 40 pages. Added details in the proof of Theorem 3.17 (for the implication (iv) to (i)); the statement of Theorem 8.9 contained a typo (isomorphism symbol instead of the Delta-equivalence symbol); proof added for Theorem 8.9; corrected typos
- Published
- 2021