On the classification of binary shifts of minimal commutant index.

Price, G L · Proc Natl Acad Sci U S A · 1999

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Abstract

We provide a complete classification up to conjugacy of the binary shifts of commutant index 2 on the hyperfinite II(1) factor. There is a natural correspondence between the conjugacy classes of these shifts and polynomials over GF(2) satisfying a certain duality condition.