# Orthogonal functions

1. Oct 24, 2006

### Logarythmic

A question for my understanding:

If I have an operator $$\cal{L}$$ and a set of eigenfunctions $$\phi_n$$ of this operator, then the eigenfunctions are orthogonal. Why is that?

2. Oct 24, 2006

### OlderDan

Here is a short read on this issue.

http://vergil.chemistry.gatech.edu/notes/quantrev/node16.html

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