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I always thought that Fourier says periodic spectra could be summed to create

**any**signal. As such any distribution is a sum of "waves", and vice versus.

- Thread starter Jimster41
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I always thought that Fourier says periodic spectra could be summed to create

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BvU

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And yes, Fourier decomposition is a change of basis that goes from one basis to describe a function to another. Both bases are complete and orthogonal.

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https://www.physicsforums.com/threads/basic-questions-about-decoherence.827771/#post-5200884

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