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Shing
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Homework Statement
Shanker 1.7.1
3.)Show that the trace of an operator is unaffected by a unitary change of basis (Equivalently, show [itex]TrΩ=TrU^{\dagger}ΩU[/itex]
Homework Equations
I can show that via Shanker's hint, but I however can't see how a unitary change of basis links to [itex]TrΩ=TrU^{\dagger}ΩU[/itex], (and it really giving me a headache!) Would anyone be kind enough to explain to me?
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