I´m searching information about the wave equation in partial differential equations:
$$U_{tt}-c^{2}\Delta U=0.$$ I need the history, deduction and interpretation, if someone could tell me some books where I can find this information will be awesome.
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1Lawrence C. Evans – Physor Sep 21 '20 at 22:05
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See also Wave equation. – Alessio K Sep 21 '20 at 22:15