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<p>can be obtained as follows: For a specific macroscopic state, one uses the <a href="page.php?w=Gelfand-Naimark-Segal_construction">GNS-representation</a> to obtain a representation of the algebra of observables as linear operators on a Hilbert space, one chooses a maximally Abelian algebra of compatible observables and applies the <a href="page.php?w=Gelfand_transform">Gelfand transform</a> for Abelian C*-algebras to represent abstract observables as <b>functions</b> on a representation space of states (Gelfand space). In general, such a description</p><p>
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