| 粗糙度不等式 |
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| 引用本文： | 刘高峰. 粗糙度不等式[J]. 成都大学学报(自然科学版), 2005, 24(1): 5-7 |
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| 作者姓名： | 刘高峰 |
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| 作者单位： | 西南交通大学,理学院数学系,成都,610031 |
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| 摘 要： | 针对文献[2]中提出的粗糙度不等式及其使等号成立的充分条件,给出了使等号成立且更一般的充分条件,并以两种不同的形式给出,证明两者彼此等价,最后,给出一个新的粗糙度定义,并证明在这种定义下,下近似具有与上近似一样的不等式及其充分条件
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| 关 键 词： | 粗糙集 粗糙度 上近似 下近似 |
| 文章编号： | 1004-5422(2005)01-0005-03 |
| 修稿时间： | 2004-10-29 |
Inequality of Rough Degree |
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| Liu Gaofeng. Inequality of Rough Degree[J]. Journal of Chengdu University (Natural Science), 2005, 24(1): 5-7 |
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| Authors: | Liu Gaofeng |
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| Abstract: | Based on the sufficient condition in this literature, the paper proposes two kinds of sufficient condition of inequality of rough degree. Then it shows that they are equivalent and the sufficient condition in the literature is a special one. At last, a new definition of the rough degree is proposed, and lower approximation has the same inequality and the sufficient condition as upper approximation under the new definition. |
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| Keywords: | rough set rough degree upper approximation lower approximation |
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