Abstract
The effects in a quantum-mechanical system form a partial algebra and a partially ordered set which is the prototypical example of the effect algebras discussed in this paper. The relationships among effect algebras and such structures as orthoalgebras and orthomodular posets are investigated, as are morphisms and group- valued measures (or charges) on effect algebras. It is proved that there is a universal group for every effect algebra, as well as a universal vector space over an arbitrary field.
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Foulis, D.J., Bennett, M.K. Effect algebras and unsharp quantum logics. Found Phys 24, 1331–1352 (1994). https://doi.org/10.1007/BF02283036
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DOI: https://doi.org/10.1007/BF02283036