If is a permutation of degree such that replaces each element by the element itself, is called the identity permutation of degree . Thus

Or

Or

is the identity permutation of degree .

**For example**, is the identity permutation on

If is a permutation of degree such that replaces each element by the element itself, is called the identity permutation of degree . Thus

Or

Or

is the identity permutation of degree .

**For example**, is the identity permutation on