Notes on "the lower and upper approximations in a fuzzy group" and "rough ideals in semigroups"

被引：27
|
作者：
Cheng, Wei [1 ]
Mo, Zhi-Wen
Wang, Jue
机构：
[1] Univ Elect Sci & Technol China, Coll Comp Sci & Engn, Chengdu 610054, Peoples R China
[2] Sichuan Normal Univ, Coll Math & Software Sci, Chengdu 610066, Peoples R China
[3] Chinese Acad Sci, Inst Automat, Beijing 100080, Peoples R China
来源：
INFORMATION SCIENCES | 2007年 / 177卷 / 22期
基金：
中国国家自然科学基金;
关键词：
rough set; group; normal subgroup; ring; ideal;
D O I：
10.1016/j.ins.2006.12.006
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
In this note, we show by examples that Propositions 2.4 and 2.5 in [N. Kuroki, P.P. Wang, The lower and upper approximations in a fuzzy group, Information Sciences 90 (1996) 203] and Theorem 2.5 in [N. Kuroki, Rough ideals in semigroups, Information Sciences 100 (1997) 139] are incorrect and offer their modified versions. (C) 2007 Elsevier Inc. All rights reserved.
引用
收藏
页码：5134 / 5140
页数：7
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