Term algebras of elementarily equivalent atom structures
Hajnal Andréka, Istvàn Németi · Repository of the Academy's Library (Library of the Hungarian Academy of Sciences) · 2018
We exhibit two relation algebra atom structures such that they are elementarily equivalent but their term algebras are not. This answers Problem 14.19 in the book Hirsch, R. and Hodkinson, I., "Relation Algebras by Games", North-Holland, 2002.