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Principle Of Superposition
Definition: If y_1 and y_2 are two solutions of the differential equation y'' + p(t)y' + q(t)y = 0, then the linear combination (c_1)(y_1) + (c_2)(y_2) is also a solution for any values of the constants c_1 and c_2.
Source: Elementary Differential Equations and Boundary Value Problems - William Boyce & Richard DiPrima