The Hypergroups of Order 3
by Nikos Lygeros
Abstract - In the first part, via the transposition of the theorems of
Birkhoff, Chaunier-Lygeros and Lygeros-Mizony on Groups to P-Hypergroups,
we explicit some relations between posets and hypergroups. In the second
part, we generalize Vougiouklis results on hypergroups of order 2 and we
enumerate and classify all the Hypergroups of order 3.