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Group-valued measures on coarse-grained quantum logics. (English) Zbl 1174.03350

Summary: In [S. Gudder and J.-P. Marchand [Bull. Acad. Pol. Sci., Sér. Sci. Math. 28, 557–564 (1980; Zbl 0499.28002)] it was shown that a (real) signed measure on a cyclic coarse-grained quantum logic can be extended, as a signed measure, over the entire power algebra. Later [P. G. Ovchinnikov, Konstr. Teor. Funkts. Funkts. Anal. 8, 95–98 (1992; Zbl 0825.03058)] this result was re-proved (and further improved) and, moreover, the non-negative measures were shown to allow for extensions as non-negative measures. In both cases the proof techniques used were those of linear algebra. In this paper we further generalize the results cited by extending group-valued measures on cyclic coarse-grained quantum logics (or non-negative group-valued measures for lattice-ordered groups). Obviously, the proof techniques are entirely different from those of the preceding papers. In addition, we provide a new combinatorial argument for describing all atoms of cyclic coarse-grained quantum logics.

MSC:

03G12 Quantum logic
06C15 Complemented lattices, orthocomplemented lattices and posets
28B10 Group- or semigroup-valued set functions, measures and integrals
81P10 Logical foundations of quantum mechanics; quantum logic (quantum-theoretic aspects)

References:

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