Neutrosophic Set in Medical Image Analysis

12 Neutrosophic rough sets and their extensions

For the study of fusion about SVNS and rough sets, (Liu et al., 2017; Yang et al., 2017) defined SVNRS.

Definition 37

Suppose S is a SVNR in ξ, $\tilde{A}\in$SVNS(ξ), the lower and upper approximations of $\tilde{A}$ with respect to (ξ, $\tilde{S}$), abbreviated as $\underset{¯}{S}\left(\tilde{A}\right)$ and $\overline{S}\left(\tilde{A}\right)$, are two SVNSs whose membership functions are defined ...