【摘要】 本文给出了理想的并未必为理想的例证 ;并引进了亚并理想的概念 ,且给出了格中亚并理想的任意交、任意并的封闭性 .更多还原

【Abstract】 In this paper,we have examplied that the union of ideals of a lattice needs not be a ideal of a lattice.In a lattice the definition of metajoin-ideal has been introduced,and the family of all metajoin-ideals is closed under arbitrary intersection as well as arbitrary union.更多还原