http://vallance.chem.ox.ac.uk/pdfs/VariationPrincipleNotes.pdf(adsbygoogle = window.adsbygoogle || []).push({});

In the proof above I need to understand why: $$S_{ij}=S_{ji}$$. Which is the same as proving

$$\int f_i f_j dg=\int f_j f_i dg$$ (I)

Not sure about what I should call the variable for so I called it g. Can someone prove this from the basics? From starting from defintion of complex functions and start from left of (I) and get to the right of (I). I know that complex times complex conjugate gives probability. Thank you!

In the link this is introduced at page 2 as $$<f_i|f_j>$$

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# Problem in basic equalities for Huckel energy

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