CATEGORICAL ABSTRACT LOGIC: HIDDEN MULTI-SORTED LOGICS AS MULTI-TERM π-INSTITUTIONS.

Babenyshev and Martins proved that two hidden multi-sorted deductive systems are deductively equivalent if and only if there exists an isomorphism between their corresponding lattices of theories that commutes with substitutions. We show that the π-institutions corresponding to the hidden multi-sorted deductive systems studied by Babenyshev and Martins satisfy the multi-term condition of Gil-Féerez. This provides a proof of the result of Babenyshev and Martins by appealing to the general result of Gil-Féerez pertaining to arbitrary multi-term π-institutions. The approach places hidden multi-sorted deductive systems in a more general framework and bypasses the laborious reuse of well-known proof techniques from traditional abstract algebraic logic by using "off the shelf" tools. [ABSTRACT FROM AUTHOR]