# Normal matrices

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Show that each matrix type is normal.

1. Hermitian

2. skew-Hermitian

3. unitary

4. symmetric

5. skew-symmetric

6. orthogonal

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##### Solution Summary

This shows how to prove that each matrix type is normal.

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I will use the notation:

A^T = transpose(A)

A^* = complex_conjugate(A)

A^t = (A^T)^* = hermitian_conjugate(A)

A^i = inverse(A)

A matrix, A, is defined to normal if and only if

[A , A^t] = A A^t - A^t A = 0

(comment: A matrix, A, is also normal if and only if there exists a unitary matrix, U, such that (U A U^t) is ...

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