06080604

j

06080604 Kim, Yong Chan Soft lower and upper approximations. Int. J. Contemp. Math. Sci. 7, No. 13-16, 641-648 (2012). 2012 Hikari Ltd, Ruse EN soft rough approximations soft rough sets

http://www.m-hikari.com/ijcms/ijcms-2012/13-16-2012/index.html

Summary: We introduce the notion of soft $(\underline {apr}_P, \overline {apr}_P)$ (respectively $(\underline {Apr}_P, \overline {apr}_P)$, $(\underline {apr}_P, \overline {Apr}_P)$, $(\underline {Apr}_P,\overline {Apr}_P)$) rough approximations.