Classification of integro-differential C∗C^*-algebras

preprint2020arXivOpen access

Abstract

The integro-differential algebra FN,M\mathscr{F}_{N,M} is the C∗C^*-algebra generated by the following operators acting on L2([0,1)N→CM)L^2([0,1)^N\to\mathbb{C}^M): 1) operators of multiplication by bounded matrix-valued functions, 2) finite differential operators, 3) integral operators. We give a complete characterization of FN,M\mathscr{F}_{N,M} in terms of its Bratteli diagram. In particular, we show that FN,M\mathscr{F}_{N,M} does not depend on MM but depends on NN. At the same time, it is known that differential algebras HN,M\mathscr{H}_{N,M}, generated by the operators 1) and 2), do not depend on both dimensions NN and MM, they are all ∗*-isomorphic to the universal UHF-algebra. We explicitly compute the Glimm-Bratteli symbols (for HN,M\mathscr{H}_{N,M} it was already computed earlier) n(FN,M)=∏n=1∞(n0n−11)⊗N(11)⊗N,    n(HN,M)=∏n=1∞n, \mathfrak{n}(\mathscr{F}_{N,M})=\prod_{n=1}^{\infty}\begin{pmatrix} n & 0 \\ n-1 & 1 \end{pmatrix}^{\otimes N}\begin{pmatrix}1 \\ 1 \end{pmatrix}^{\otimes N},\ \ \ \ \mathfrak{n}(\mathscr{H}_{N,M})=\prod_{n=1}^{\infty}n, which characterize completely the corresponding AF-algebras.

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