Ustav matematiky FS VUT, Technicka 2, 616 69 Brno, Czech Republic
Abstract: A projection of a relation is defined as a relation of reduced arity. The paper deals with projections of relations in coherence with their reflexivity, symmetry, completeness, regularity, cyclicity and other properties. Relationships between projections of hulls and hulls of projections are also studied.
Keywords: relation, $n$-decomposition, diagonal, $(\Cal K,\varphi)$-modification, $(p)$-hull, $(q,X)$-projection
Classification (MSC 1991): 04A05, 08A02
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