On spectral polynomials of the Heun equation

Details On spectral polynomials of the Heun equation On spectral polynomials of the Heun equation

2008-12-12

arxiv.org/abs/0812.2321v1

Physics

Mathematical Physics

14 pages, 5 figures

Scientific paper

The classical Heun equation has the form {Q(z) d^2/dz^2 +P(z) d/dz +V(z)}S(z)=0 where Q(z) is a cubic, P(z) at most quadratic and V(z) linear polynomials resp. In the second half of the 19-th century E.Heine and T.STieltjes initiated the study of the set of all V(z) such that the above equation has a polynomial solution S(z) of a given degree n. The main goal of the present paper is to study the union of the roots of the latter set of V(z)*s when n->oo. We formulate an intriguing conjecture of K.Takemura describing the limiting set and give a substantial amount of additional information.

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