NONLINEAR DIFFERENTIAL EQUATIONS
www.ams.org › S0002/9904/1955-09934-8original equation is a second order ordinary differential equation, but in that case the theory (Hill theory) is already known. The present theory gets around this difficulty by basing the proof of the existence of a solution upon the " trend" functions that one would have to calculate anyway in order to obtain an approximation to the solution.
Second Order Linear Differential Equations
www.personal.psu.edu › sxt104 › classSecond order linear equations with constant coefficients; Fundamental solutions; Wronskian; Existence and Uniqueness of solutions; the characteristic equation; solutions of homogeneous linear equations; reduction of order; Euler equations In this chapter we will study ordinary differential equations of the standard form below, known as the ...