The CAR algebra admits countably many pairwise non-conjugate C*-diagonals with Cantor spectrum, distinguished by diagonal dimension, including non-AF examples.
Witten multiple zeta values attached to sl(4)
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In this paper we shall prove that every Witten multiple zeta value of weight w>3 attached to sl(4) at nonnegative integer arguments is a finite rational linear combinations of MZVs of the weight w and the depths three or less, except for the nine irregular cases where the Riemann zeta value zeta(w-2) and the double zeta values of weight w-1 and depth <3 are also needed.
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Paper-folding models for the CAR algebra
The CAR algebra admits countably many pairwise non-conjugate C*-diagonals with Cantor spectrum, distinguished by diagonal dimension, including non-AF examples.