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math.LO2026
Representability for distributive quasi relation algebras via nested sums
Andrew Craig, Claudette Robinson, Wilmari Morton
We extend the work of Galatos (2004) on nested sums, originally called generalised ordinal sums, of residuated lattices. We show that the nested sum of an odd quasi relation algebr…
math.LO2025
Correspondence Theory for Many-valued Modal Logic
Cecelia Britz, Willem Conradie, Wilmari Morton
The aim of the present paper is to generalise Sahlqvist correspondence theory to the many-valued modal semantics defined by Fitting, assuming a perfect Heyting algebra as truth val…