A few remarks on intermediate subalgebras of an inclusion of -algebras

KC Bakshi, S Guin, D Jana - arXiv preprint arXiv:2311.07244, 2023 - arxiv.org
KC Bakshi, S Guin, D Jana
arXiv preprint arXiv:2311.07244, 2023arxiv.org
In this short note, we prove that the angle between intermediate $ C^* $-subalgebras of an
inclusion of simple $ C^* $-algebras with finite Watatani index is stable. The notion of angle
is instrumental in providing a bound for the cardinality of the lattice of intermediate
subalgebras for an irreducible inclusion of simple $ C^* $-algebras. We improve the existing
upper bound for the cardinality of this set.
In this short note, we prove that the angle between intermediate -subalgebras of an inclusion of simple -algebras with finite Watatani index is stable. The notion of angle is instrumental in providing a bound for the cardinality of the lattice of intermediate subalgebras for an irreducible inclusion of simple -algebras. We improve the existing upper bound for the cardinality of this set.
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