On spectral polynomials of the Heun equation. II

Boris Shapiro, Kouichi Takemura, Milos Tater

The well-known Heun equation has the form: Q(z)S''(z)+P(z)S'(z)+V(z)S(z)=0 where Q(z) is a cubic complex polynomial, P(z) and V(z) are polynomials of degrees at most 2 and 1 resp.…