The chapter states:"
Such an evolution of isolated systems is caused by a unitary matrix (matrices which are their own conjugate transpose and inverse)."
Is the statement in the parenthesis a typo?
Unitary matrices are not their own conjugate transpose. Hermitian matrices are their own conjugate transpose.
I think the intention here is to say matrices whose inverse is their own conjugate transpose.
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Course: https://www.educative.io/collection/10370001/4797120098336768
Lesson: https://www.educative.io/collection/page/10370001/4797120098336768/5475094468493312