Important: The regularsp command has been deprecated.  Use the superseding command DEtools[singularities], which computes both the regular and irregular singular points, instead.

The regularsp command determines the regular singular points of a given second order linear ordinary differential equation. The ODE could be given as a standard differential equation or as a list with the ODE coefficients (see DEtools[convertAlg]). Given a linear ODE of the form

a point alpha is considered to be a regular singular point if

The results are returned in a list.  In the event that no regular singular points are found, an empty list is returned.

Warning, DEtools[regularsp] has been superseded by DEtools[singularities]