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I have to show that a unitary operator [itex] U [/itex] can be written as

[tex]

U=\frac{\mathbf{1}+iK}{\mathbf{1}-iK}

[/tex]

where [itex] K [/itex] is a Hermitian operator.

Now how could you possibly have a fraction of operators if those can be represented by matrices? Not sure what to do here.

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# Unitary operator U ?

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