FRD_辖区及RF_右析取语言  

FRD__domains and RF__right Disjunctive Languages

作　　者：王浩[1] 

机构地区：[1]西北大学数学系

出　　处：《纯粹数学与应用数学》1991年第1期5-10,共6页Pure and Applied Mathematics

摘　　要：<正> 1 FRD_辖区设∑是一个有限字母表,∑~*表示由∑生成的自由幺半群,其子集合称为语言。由语言L?A languafes L is called RF__right disjunctive, if there exists a right dense lan-guage D such that every R_L__class [X]_L conttains only a finite number of words in D. In or-der to investigate it, we introduced and discussed the FRD_domains in this paper. When |∑|≥2, D is uniformly right dense iff D is an FRD__domain and D is a strongly right denselanguage. By the way, an infinite hierarchy of right dense languages is obtained.

关 键 词：FRD辖哎 RF右析取语言 右稠密语言 右理想 

分 类 号：O153.3[理学—数学]