It is the multiplicative identity.
This means that for all numbers x,
x * 1 = 1 * x = x
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property of negative exponents
zero property additive property
the identity property of multiplication. from, ace
something that is owned like a rectangle owns four cortices and two parallel lines.
There is not Substitution Property of Congruence. There is, however, one for Equality, called the Substitution Property of Equality.