Solving ordinary differential equations using the differential operator D I know how to solve linear homogeneous ordinary differential equations with constant coefficients using the differential operator D, by using this method.
Is it possible to use a similar method (using the differential operator) to solve more advanced ODEs? I'm thinking of both more advanced linear ODEs, such as Euler-Cauchy differential equations, as well as non-linear ODEs.
Are there any articles on the web on this topic, or even textbooks that use this method to solve ODEs?
 A: There is a large literature on "operational calculus" dating back to Heaviside's pioneering work. One particularly powerful operator factorization technique is the Infeld - Hull ladder method - which plays a big role in unifying many classes of special functions that arise in physics (mainly via separation of variables in various coordinate systems). Willard Miller showed that this method is equivalent to the representation theory of four local Lie groups. This lie-theoretic approach served to powerfully unify and "explain" all prior similar attempts to provide a unfied theory of such classes of special functions. See my post here for further details and references.
A: I am also an enthusiast of this technique solve a differential equation (See this link). With the operator D, we find the general solution of non-linear equations homogenêneas with f being a polynomial, trigonometric functions, exponential, or combinations of these. You can also define a differential operator to study the differential equations of Euler-Cauchy type.
