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# Substitution Postulate

Written by Jerry Ratzlaff. 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.