
The authors start from a factored equation \(\prod^N_{j=1} ({d\over dt}- A_j)u(t)=0\) with commuting generators \(A_j\) and the corresponding d'Alembert formula for the solutions \(u(t)= \sum^N_{j=1} e^{tA_j}x_j\). They find the appropriate generalization in the case of nonautonomous and inhomogeneous equations. Interesting examples are given.
linear evolution equations, Linear differential equations in abstract spaces, Applied Mathematics, d'Alembert formula, Operator sine and cosine functions and higher-order Cauchy problems, Analysis, nonautonomous and inhomogeneous equations
linear evolution equations, Linear differential equations in abstract spaces, Applied Mathematics, d'Alembert formula, Operator sine and cosine functions and higher-order Cauchy problems, Analysis, nonautonomous and inhomogeneous equations
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