for C being non empty set
for V being non empty right_complementable Abelian add-associative right_zeroed vector-distributive scalar-distributive scalar-associative scalar-unital RLSStruct
for f1, f2 being PartFunc of C,V
for f3 being PartFunc of C,REAL holds (f3 (#) f1) - (f3 (#) f2) = f3 (#) (f1 - f2)