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Approximation of quasi-states on manifolds. (English) Zbl 07103893
Summary: Quasi-states are certain not necessarily linear functionals on the space of continuous functions on a compact Hausdorff space. They were discovered as a part of an attempt to understand the axioms of quantum mechanics due to von Neumann. A very interesting and fundamental example is given by the so-called median quasi-state on $$S^2$$. In this paper we present an algorithm which numerically computes it to any specified accuracy. The error estimate of the algorithm crucially relies on metric continuity properties of a map, which constructs quasi-states from probability measures, with respect to appropriate Wasserstein metrics. We close with non-approximation results, particularly for symplectic quasi-states.
##### MSC:
 65D99 Numerical approximation and computational geometry (primarily algorithms) 46J99 Commutative Banach algebras and commutative topological algebras 53D99 Symplectic geometry, contact geometry
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