S-rough equivalent classes and knowledge dynamic miningdiscovery
XU Feng-sheng1, YU Xiu-qing1, ZHANG Huan-li2
1. Department of Mathematics Sciences, Dezhou University, Dezhou 253023, Shandong, China;
2. Department of Information Engineering, Zhumadian Vocational and Technical College, Zhumadian 463000, Henan, China