International Journal of Mathematics and Mathematical Sciences
Volume 14 (1991), Issue 2, Pages 293-304
doi:10.1155/S0161171291000340
Abstract
In this paper we study some properties of the semi-sub-hypergroups and the
closed sub-hypergroups of the hypergroups. We introduce the correlated elements and
the fundamental elements and we connect the concept antipodal of the latter with
Frattin's hypergroup. We also present Helly's Theorem as a corollary of a more
general Theorem.