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arXiv · 2111.02903

Tolerance relations and operator systems

Alain Connes·Walter D. van Suijlekom
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Abstract

We extend the scope of noncommutative geometry by generalizing the construction of the noncommutative algebra of a quotient space to situations in which one is no longer dealing with an equivalence relation. For these so-called tolerance relations, passing to the associated equivalence relation looses crucial information as is clear from the examples such as coarse graining in physics or the relation $d(x,y)< \varepsilon$ on a metric space. Fortunately, thanks to the formalism of operator systems such an extension is possible and provides new invariants, such as the $C^*$-envelope and the propagation number. After a thorough investigation of the structure of the (non-unital) operator systems associated to tolerance relations, we analyze the corresponding state spaces. In particular, we determine the pure state space associated to the operator system for the relation $d(x,y)< \varepsilon$ on a path metric measure space.

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Alain Connes, Walter D. van Suijlekom. 2021-11-03. Tolerance relations and operator systems. https://arxiv.org/abs/2111.02903

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