Hi, I am wondering what mistake i might have made in the following.(adsbygoogle = window.adsbygoogle || []).push({});

(v, Au) = [(v, Au)*]* = [(A†v, u)*]* = (u, A†v)* = ((A†)†u, v)* = (v, (A†)†u), where v and u are arbitrary vectors in a Hilbert space. That proves that A = (A†)†, doesn't it?

My tutor says some of the steps are wrong. What might those be?

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# Adjoint of an operator

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