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The Postulates of Quantum Mechanics

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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Hello @Samir_Lipovaca,

No, the definition in the parenthesis is not a typo. A unitary matrix is a matrix whose inverse is equal to its conjugate transpose and vice versa. Also if the product of the inverse of a matrix and conjugate transpose is identity matrix then it is said to be a Unitary Matrix