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Reflections and powers of multisorted minions

Lehtonen, Erkko; Pöschel, Reinhard

Algebra Universalis, 82 (2021), Art. 20

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.