Heine–Stieltjes polynomials
In mathematics, the Heine–Stieltjes polynomials or Stieltjes polynomials, introduced by , are polynomial solutions of a second-order Fuchsian equation, a differential equation all of whose singularities are regular. The Fuchsian equation has the form for some polynomial "V"("z") of degree at most "N" − 2, and if this has a polynomial solution "S" then "V" is called a Van Vleck polynomial (after Edward Burr Van Vleck) and "S" is called a Heine–Stieltjes polynomial. Heun polynomials are the special cases of Stieltjes polynomials when the differential equation has four singular points.