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Past exam of the mathematical methods I course of the University of Oxford / 2016 / 11 / a / ii

Codex (@codex,  0) ... Year 1 of the physics course of the University of Oxford Mathematical methods I course of the University of Oxford Past exam of the mathematical methods I course of the University of Oxford 2016 11 a
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ii
The conjugate transpose also reverses factor order. If U and V are unitary matrices,
(UV)†(UV)=V†U†UV=V†IV=I.
(1)
Thus their product is unitary. This is closure under multiplication in the unitary group.

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