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- W2897526535 abstract "We prove that persistently finite algebras are not created by completions of algebras, in any ordered discriminator variety. A persistently finite algebra is one without infinite simple extensions. We prove that finite measurable relation algebras are all persistently finite. An application of these theorems is that the variety generated by the completions of representable relation algebras does not contain all relation algebras. This answers Problem 1.1(1) from a paper by R. Maddux in the negative. At the same time, we confirm the suggestion in that paper that the finite maximal relation algebras constructed in a joint paper by M. Frias and R. Maddux are not in the variety generated by the completions of representable relation algebras. We prove that there are continuum many varieties between the variety generated by the completions of representable relation algebras and the variety of relation algebras." @default.
- W2897526535 created "2018-10-26" @default.
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- W2897526535 date "2018-10-10" @default.
- W2897526535 modified "2023-09-23" @default.
- W2897526535 title "Varieties generated by completions" @default.
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- W2897526535 doi "https://doi.org/10.48550/arxiv.1810.04569" @default.
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