id: 06080604 dt: j an: 06080604 au: Kim, Yong Chan ti: Soft lower and upper approximations. so: Int. J. Contemp. Math. Sci. 7, No. 13-16, 641-648 (2012). py: 2012 pu: Hikari Ltd, Ruse la: EN cc: ut: soft rough approximations; soft rough sets ci: li: http://www.m-hikari.com/ijcms/ijcms-2012/13-16-2012/index.html ab: 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. rv: