*Definition [#ub71323b]
-The relative complement of a soft set (F , A) is denoted by (F , A)' and is defined by (F , A)' = (F' , A) where F' : A → P(U) is a mapping given by F'(α) = U － F(α) for all α ∈ A.

*Reference [#q0fb6033]
-Shabir Muhammad, Naz Munazza, ''On soft topological spaces.'' (English summary), Comput. Math. Appl. 61 (2011), no. 7, 1786-1799.