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中文摘要：
LI-理想是研究格蕴涵代数结构特征的一个重要的工具性概念.综合运用代数学与逻辑学的方法和原理对格蕴涵代数的LI-理想理论作进一步深入研究.首先,引入格蕴涵代数L的LI-理想A关于L的子集M的扩展LI-理想及稳定LI-理想概念并考察它们的基本性质.其次,讨论了L的几类扩展LI-理想集的格论特征.证明了L的关于一个给定子集M？L的稳定LI-理想全体之集S（M）与L的一个LI-理想A关于任意子集M？L的扩展LI-理想全体之集EA均构成完备Heyting代数的结论.再次,给出了商格蕴涵代数和乘积格蕴涵代数的扩展LI-理想的若干性质.最后,借助于L的扩展LI-理想之特性获得了L的ILI-理想的若干等价刻画.
英文摘要：
LI-ideals is an important tool for studying the structure characteristics of lattice implication algebras. In this paper, the theory of LI-ideals in lattice implication algebras was further studied by using the methods and principles of algebra and logic. Firstly, the notions of extended LI-ideals and stable LI-ideals of a LI-ideal A associated to a subset M of lattice implication algebra L are introduced and some of their basic properties are investigated. Secondly, some lattice theory characteristics about some types sets of extended LI-ideals in a lattice implication algebra L are discussed. It＇s proved that the set of all stable LI-ideals associated to a given subset M ？ L and the set of all extended LI-ideals of LI-ideals A associated to any subset of L both form complete Heyting algebras. Thirdly, some properties of extended LI-ideals in quotient and product lattice implication algebras are given. Finally, some equivalent characterizations of ILI-ideals are obtained by means of extended LI-ideals in lattice implication algebras.
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