KOUIDER, KhaoulaEncadreur: AMROUNE, Abdelaziz2022-07-122022-07-122022-06-10http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/30171In this memory, we try to assimilate the concepts related to the theory of relations and the theory of orders and lattices to accomplish the delay known during our training. This is why we have tried to give many examples, give elementary and detailed demonstrations of the theorems and propositions made in these courses.frConstruction : notions d’ordre : treillisThesis