Counting Integral Lam\'e Equations by Means of Dessins d'Enfants
Abstract
We obtain an explicit formula for the number of Lam\'e equations (modulo scalar equivalence) with index n and projective monodromy group of order 2N, for given n ∈ and N ∈ . This is done by performing the combinatorics of the `dessins d'enfants' associated to the Belyi covers which transform hypergeometric equations into Lam\'e equations by pull-back.
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