I need the proofs of following two theorems. Please help me

1) A hermitian matrix remains hermitian under unitary transformation.

2) A hermitian matrix remains hermitian when transformed by an orthogonal matrix.

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- Mar 16th 2011, 05:47 PMSuvadipProofs on Hermitian matrices.
I need the proofs of following two theorems. Please help me

1) A hermitian matrix remains hermitian under unitary transformation.

2) A hermitian matrix remains hermitian when transformed by an orthogonal matrix. - Mar 16th 2011, 05:49 PMdwsmith
- Mar 16th 2011, 05:52 PMSuvadip
Please give me just hints