机构地区: 陕西师范大学数学与信息科学学院
出 处: 《纺织高校基础科学学报》 2008年第4期429-434,共6页
摘 要: 通过定义完备格L上的预余拓扑、预闭包算子、预外导算子族、预内部算子、覆盖族及它们上的序关系,研究给定完备格L上预余拓扑的确定方式.证明了(1)给定完备格L上预余拓扑的全体、预闭包算子的全体构成了彼此同构的完备格;(2)当L是闭集格时,L上预外导算子族的全体与预余拓扑的全体构成了彼此同构的完备格;(3)当L是完备DeMorgan代数时,L上的预余拓扑的全体、预内部算子的全体、覆盖族的全体构成了彼此同构的完备格.因此给定完备格L上的预余拓扑可以由L上的预闭包算子、预外导算子族、预内部算子及覆盖族确定. The notions of pre-cotopology, pre-closure operator, family of pre-outside-derived operators, pre-interior operator, family of covers, and their orders on a given complete lattice are introduced, and the way to determine pre-cotopologies on a complete lattice is studied. It is proved that, for a given com- plete lattice L, (1) Both (CT(L) ,C) (the set of all pre-cotopologies on L) and (CL(L), ≤) (the set of all pre-closure operators on L) are complete lattices which are isomorphic each other. (2) If L is a closed- set lattice, then both (CT(L) ,C) and (FD(L), ≤) (the set of all families of pre-outside-derived operators on L) are complete lattices which are isomorphic each other. (3) If L is a complete DeMorgan algebra, then both (IN(L), ≤) (the set of all pre-interior operators) and (FC(L), ≤) (the set of all families of covers on L) are complete lattices which are isomorphic with (CT(L),C). Thus a pre-cotopology on a given complete lattice may be determininated by a pre-closure operator, a family of pre-outside-derived operators, a pre-interior operator, or a family of covers.