reduced wave equation

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• Sinusoidal plane-wave solutions of the electromagnetic wave equation — Sinusoidal plane wave solutions are particular solutions to the electromagnetic wave equation.The general solution of the electromagnetic wave equation in homogeneous, linear, time independent media can be written as a linear superposition of… …   Wikipedia

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• John's equation — is an ultrahyperbolic partial differential equation satisfied by the X ray transform of a function. It is named after Fritz John.Given a function f:mathbb{R}^n ightarrow mathbb{R} with compact support the X ray transform is the integral over all… …   Wikipedia

• Matrix differential equation — A differential equation is a mathematical equation for an unknown function of one or several variables that relates the values of the function itself and of its derivatives of various orders. A matrix differential equation is one containing more… …   Wikipedia