Abstract
A block of an effect algebra is a maximal sub-effect algebra with some kind of compatibility property. Jenča (Australian Math. Soc. 64, 81–98, 2001), shows that every block of a homogeneous effect algebra satisfies the Riesz Decomposition Property (RDP). We establish that in a monotone \(\sigma\)-complete effect algebra, every block is a monotone \(\sigma\)-complete sub-effect algebra with (RDP). This result is used to show a one-to-one relationship between observables and spectral resolutions, as well as for n-dimensional observables and n-dimensional spectral resolutions. This result extends the class of effect algebras where this relationship holds.
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The paper acknowledges the support by the grant of the Slovak Research and Development Agency under contract APVV-20-0069 and the grant VEGA No. 2/0142/20 SAV, A.D., and the Austrian Science Fund (FWF), project I 4579-N and the Czech Science Foundation (GAČR), project 20-09869L, D.L.
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Dvurečenskij, A., Lachman, D. Homogeneous Effect Algebras and Observables vs Spectral Resolutions. Int J Theor Phys 61, 214 (2022). https://doi.org/10.1007/s10773-022-05185-9
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DOI: https://doi.org/10.1007/s10773-022-05185-9