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Название: A Characterization of 1-, 2-, 3-, 4-Homomorphisms of Ordered Sets
Авторы: Halas L., Hort D.
We characterize totally ordered sets within the class of all ordered sets containing at least four-element chains. We use a simple relationship between their isotone transformations and the so called 1-endomorphism which is introduced in the paper. Later we describe 1-, 2-, 3-, 4-homomorphisms of ordered sets in the language of super strong mappings.