Oscillation theory of ordinary linear differential equations

Introduction to the Galois Theory of Linear Ordinary Differential Equations

We define the differential Galois group of a linear homogeneous ordinary differential equation and illustrate the type of information about solutions packaged within. The initial format is classical; at the end we indicate how the results can be conceptualized geometrically.

The Picard-Vessiot Theory of Homogeneous Linear Ordinary Differential Equations.

Oscillation of Solutions of Linear Differential Equations

In this note we study the zeros of solutions of differential equations of the form u + pu = 0. A criterion for oscillation is found, and some sharper forms of the Sturm comparison theorem are given. §1. Number of zeros. Consider the linear differential equation u′′(x) + p(x) u(x) = 0 , where p(x) = 1 (1− x) , (1) on the interval −1 < x < 1. Two independent solutions are

A Survey on Oscillation of Impulsive Ordinary Differential Equations

This paper summarizes a series of results on the oscillation of impulsive ordinary differential equations. We consider linear, half-linear, super-half-linear, and nonlinear equations. Several oscillation criteria are given. The Sturmian comparison theory for linear and half linear equations is also included.

General linear methods for ordinary differential equations

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