This paper is divided in
three parts. The first part deals with the equivalence of finite determination
on the right and finite relative determination (with respect to S) under
some conditions on S. The second part deals with infinite determinacy (with
respect to S, a germ of a closed set of ℝn). Both generalize results of P.
Porto [On relative stability of function germs, Bol. Soc. Bras. Mat., 14(2)
(1983), 99–108.] for a big family of closed subsets S of ℝn. The third part is a
special case which is quite interesting, when S coincides with the closure of its
interior.