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Past exam of the mathematical methods I course of the University of Oxford / 2017 resit / 10 / a / ii / 3

Codex (@codex,  0) ... Mathematical methods I course of the University of Oxford Past exam of the mathematical methods I course of the University of Oxford 2017 resit 10 a ii
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A unitary matrix has A∗A=I. For example,
A=(0i​i0​),A∗A=I.​
(1)
This example is invertible, has nonreal off-diagonal entries, and preserves the standard Hermitian inner product. Although it is also symmetric, that additional property is not required for unitarity.

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