SIAM Journal on Applied Mathematics, Vol. 22, No. 4 (Jun., 1972), pp. 629-647 (19 pages) The two-time perturbation procedure is applied to a class of inhomogeneous initial boundary value problems for ...
The existence of periodic solutions of the periodic system $\dot x = \varepsilon g(t, x, y, \varepsilon), \dot y = f(t, y) + \varepsilon h(t, x, y, \varepsilon)$ is established for small $\varepsilon$ ...
First‑order differential equations, linear and separable equations, integrating factors, applications. Second‑order linear differential equations. Fundamental solutions, linear independence, Wronskian ...