Freni, Domenico A note on the core of a hypergroup and on the transitive closure \(\beta^*\) of \(\beta\). (Une note sur le coeur d’un hypergroupe et sur la cloture transitive \(\beta^*\) de \(\beta\).) (French) Zbl 0780.20047 Riv. Mat. Pura Appl. 8, 153-156 (1991). Summary: A new characterization of the core of a hypergroup is obtained and it can be shown that in each hypergroup we have \(\beta^* = \beta\). Cited in 39 Documents MSC: 20N20 Hypergroups 08A30 Subalgebras, congruence relations Keywords:core; hypergroup PDFBibTeX XMLCite \textit{D. Freni}, Riv. Mat. Pura Appl. 8, 153--156 (1991; Zbl 0780.20047)