Amalgamation, interpolation and epimorphisms in algebraic logic
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In his landmark paper on amalgamation published in Algebra Universalis in 1971, Don Pigozzi posed some open questions in connection with amalgamation of subclasses of cylindric algebras. Some of these questions were originally raised by Comer, Daigneault, Johnson, McKenzie and others. In this paper we give answers to all these as well as a number of other related questions. Most of the solutions were found by the authors of this paper. However, a few were contributed by others who will of course be given due credit at the appropriate points.
2000 Mathematics Subject Classification:03G15
Keywords and phrases:Amalgamation interpolation epimorphisms cylindric algebras
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