Email Print Substitution Postulate on 02 February 2016. Posted in Algebra A postulate is a statement that is assumed true without proof. Let \(\;a\; \) , \(\;b\; \) and \(\;c\; \) be real numbers. If \(\;a = b\; \) , then \(\;a\; \) can be substituted for \(\;b\; \) in any expression.
