let R be domRing; :: thesis: for V being strict RightMod of R
for A, B being Subset of V st Lin A = V & A c= B holds
Lin B = V

let V be strict RightMod of R; :: thesis: for A, B being Subset of V st Lin A = V & A c= B holds
Lin B = V

let A, B be Subset of V; :: thesis: ( Lin A = V & A c= B implies Lin B = V )
assume ( Lin A = V & A c= B ) ; :: thesis: Lin B = V
then V is Submodule of Lin B by Th73;
hence Lin B = V by RMOD_2:25; :: thesis: verum