Rough Set Theory(Pawlak Rough Set or Classic Rough Set)
论文：Analysis of alternative objective functions for attribute reduction in complete decision tables
Jie Zhou; Duoqian Miao; Witold Pedrycz; Hongyun Zhang
http://or.nsfc.gov.cn/handle/00001903-5/97499
论文思路：拓展律分解原有问题，构建树，深度优先（属性次数贪心获取近似约简）搜索算法
经典粗糙集中完备性最小约简算法的C++实现（采用eigen存储矩阵）