On the semi-sub-hypergroups of a hypergroup
1991 ◽
Vol 14
(2)
◽
pp. 293-304
◽
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.
1904 ◽
Vol 24
◽
pp. 387-392
◽
1905 ◽
Vol 11
(9)
◽
pp. 482-487
1933 ◽
Vol 3
(3)
◽
pp. 179-188
Keyword(s):
1973 ◽
Vol 38
(2)
◽
pp. 331-331