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Talk:Spectral gap (physics)

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This article was accepted from this draft on 19 December 2018 by reviewer Gpkp (talk · contribs).

It should be noted that the undecideability only is for inifite "chunks" of matter, and finite ones can behave differently. This also means that the spectral gap may appear or disappear (or oscillate) if you increase/decrease the amount of matter that you are testing.