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Mathematical physics is in the first place physics and it could not exist without experimental investigations.

— Peter Debye

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Source, in full

Inaugural lecture for his professorship of mathematical physics at the University of Utrecht (1913), as quoted by Davies, Mansel. Peter Joseph Wilhelm Debye: 1884-1966. Biographical Memoirs of Fellows of The Royal Society, Vol. 16 (1970).

Attribution

Quote text and notes from Wikiquote: Peter Debye (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.