# Thread: [SOLVED] Hermitian, Unitary, and Involutory Matrices

1. ## [SOLVED] Hermitian, Unitary, and Involutory Matrices

I need to prove three things:

1) If A is hermitian and unitary, then A is involutory.
2) If A is hermitian and involutory, then A is unitary.
and
3) If A is unitary and involutory, then A is hermitian.

Thanks for any help.....