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A note on a function representation of orthomodular posets. (English) Zbl 0672.03048
Let S be a set. The author gives four conditions which are necessary and sufficient for a partially ordered set $$P\subseteq [0,1]^ S$$ to be orthomodular and admit a full set of states. This corrects an error in an earlier paper by D. Strojewski [Bull. Pol. Acad. Sci., Math. 33, 341-348 (1985; Zbl 0581.06007)] which makes the same claim for just the first three conditions. An example is given which illustrates the necessity of the fourth condition. If $$f,g\in P$$ are orthogonal then for P to be orthomodular their join must be $$f+g$$, hence $$f+g\in P$$ is required; this is condition three. The example shows that this is not enough to guarantee that the join of f and g exists.
Reviewer: M.Roddy

##### MSC:
 03G12 Quantum logic 06A06 Partial orders, general 06C15 Complemented lattices, orthocomplemented lattices and posets
##### Keywords:
orthomodular poset; full set of states
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##### References:
 [1] MACZYŃSKI M. J.: On some numerical characterization of Boolean algebras. Colloquium Mathematicum 27, 1973, 207-210. · Zbl 0264.06010 [2] MACZYŃSKI M. J., TRACZYK T.: A characterization of orthomodular partially ordered sets admitting a full set of states. Bull. Acad. Polon. Sci., Ser. Sci. Math., Astronom., Phys. 21, 1973, 3-8. · Zbl 0265.06003 [3] STROJEWSKI D.: Numerical representations of orthomodular lattices and Boolean algebras with infinite operations. Bull. Acad. Polon. Sci., Ser. Sci. Math., Astronom., Phys. 33, 1985, 341-348. · Zbl 0581.06007
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