I read somewhere that normal transformations (hermitian, unitary, orthogonal, etc...) preserves the angles between vectors.
but transformation is a function that operates on one vector, not two ( ), so what angle exactly are we talking about here?
I read somewhere that normal transformations (hermitian, unitary, orthogonal, etc...) preserves the angles between vectors.
but transformation is a function that operates on one vector, not two ( ), so what angle exactly are we talking about here?