Coba jelasin Lihat juga dari Persamaan gelombang dalam bahasa melayu dong

Persamaan gelombang elektromagnet tidak homogen

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M.F. Atiyah, R. Bott, and L. Garding, "Lacunas for hyperbolic differential operators with constant coefficients II", Acta Math., 131 (1973), 145–206.

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