Reflections and powers of multisorted minions. (English) Zbl 07317153

Summary: Classes of multisorted minions closed under extensions, reflections, and direct powers are considered from a relational point of view. As a generalization of a result of Barto, Opršal, and Pinsker, the closure of a multisorted minion is characterized in terms of constructions on multisorted relation pairs which are invariant for minions.


08A68 Heterogeneous algebras
03C05 Equational classes, universal algebra in model theory
06A15 Galois correspondences, closure operators (in relation to ordered sets)
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