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## Main Question or Discussion Point

Hi,

I am questioning about this specific proof -https://quantummechanics.ucsd.edu/ph130a/130_notes/node134.html.

Why to do this proof is needed to compute the complex conjugate of the expectation value of a physical variable? Why can't we just start with [itex] < H\psi \mid \psi > [/itex] ?

I am questioning about this specific proof -https://quantummechanics.ucsd.edu/ph130a/130_notes/node134.html.

Why to do this proof is needed to compute the complex conjugate of the expectation value of a physical variable? Why can't we just start with [itex] < H\psi \mid \psi > [/itex] ?