More localized automorphisms of the Cuntz algebras

Details More localized automorphisms of the Cuntz algebras More localized automorphisms of the Cuntz algebras

2008-08-21

arxiv.org/abs/0808.2843v1

Proc. Edinburgh Math. Soc. 53, 619-631 (2010) (and appendix)

Mathematics

Operator Algebras

17 pages

Scientific paper

We completely determine the localized automorphisms of the Cuntz algebras $O_n$ corresponding to permutation matrices in $M_n \otimes M_n$ for $n=3$ and $n=4$. This result is obtained through a combination of general combinatorial techniques and large scale computer calculations. Our analysis proceeds according to the general scheme proposed in a previous paper, where we analyzed in detail the case of $O_2$ using labeled rooted trees. We also discuss those proper endomorphisms of these Cuntz algebras which restrict to automorphisms of their respective diagonals. In the case of $O_3$ we compute the number of automorphisms of the diagonal induced by permutation matrices in $M_3 \otimes M_3 \otimes M_3$.

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