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NONREPRESENTABLE RELATION ALGEBRAS FROM GROUPS
HAJNAL ANDRÉKA, ISTVÁN NÉMETI, STEVEN GIVANT
Journal:

The Review of Symbolic Logic / Volume 13 / Issue 4 / December 2020

Published online by Cambridge University Press:

13 June 2019, pp. 861-881

Print publication:

December 2020
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A series of nonrepresentable relation algebras is constructed from groups. We use them to prove that there are continuum many subvarieties between the variety of representable relation algebras and the variety of coset relation algebras. We present our main construction in terms of polygroupoids.

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NONREPRESENTABLE RELATION ALGEBRAS FROM GROUPS