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Spherical Harmonics > Self-adjoint operators > have the property that eigenfunctions with different eigenvalues are orthogonal

Last updated at Posted at 2015-05-31

1.2 R^2 : Fourier Series
Eq.6の前

... Self-adjoint operators have the property that eigenfunctions with different eigenvalues are orthogonal.

-n^2<q_n(\theta), q_m(\theta)> = <\Delta_{2S}q_n(\theta), q_m(\theta)> = <q_n(\theta), \Delta_{2S}q_m(\theta)> = -m^2<q_n(\theta),q_m(\theta)>. --- (6)

If n != m, we must have

<q_n(\theta),q_m(\theta)> = 0.

<q_n, q_m>に対して、前に-n^2や-m^2がついたもの、あるいは片方にDelta_{2S}がついたものは同等になるようだ。

6式の由来が不明である。

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