Second-Order Ordinary Differential Equation
An ordinary differential equation of the form
(1)
Such an equation has singularities for finite under the following conditions: (a) If either or diverges as , but and remain finite as , then is called a regular or nonessential singular point. (b) If diverges faster than so that as , or diverges faster than so that as , then is called an irregular or essential singularity.
Singularities of equation (1) at infinity are investigated by making the substitution , so , giving