Reflections and powers of multisorted minions
arXiv:2001.02931 · doi:10.1007/s00012-020-00707-0
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.
18 pages, Remark 4.15 rephrased