Reflections and powers of multisorted minions
Erkko Lehtonen, Reinhard Pöschel · Algebra Universalis · 2021
Abstract 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.