MATHEMATICA BOHEMICA, Vol. 120, No. 3, pp. 283-291, 1995
Projections of relations  Jiri Karasek  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 (MSC91): 04A05,
08A02  Full text of the article: