The Restricted Weyl Group of the Cuntz Algebra and Shift Endomorphisms

Details The Restricted Weyl Group of the Cuntz Algebra and Shift Endomorphisms The Restricted Weyl Group of the Cuntz Algebra and Shift Endomorphisms

2010-06-24

arxiv.org/abs/1006.4791v1

Mathematics

Operator Algebras

Scientific paper

It is shown that, modulo the automorphisms which fix the canonical diagonal MASA point-wise, the group of those automorphisms of the Cuntz algebra O_n which globally preserve both the diagonal and the core UHF-subalgebra is isomorphic, via restriction, with the group of those homeomorphisms of the full one-sided n-shift space which eventually commute along with their inverses with the shift transformation. The image of this group in the outer automorphism group of O_n can be embedded into the quotient of the automorphism group of the full two-sided n-shift by its center, generated by the shift. If n is prime then this embedding is an isomorphism.

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