Elementary Integration of Superelliptic Integrals

preprint2021arXivOpen access

Abstract

Consider a superelliptic integral I=∫P/(QS1/k)dxI=\int P/(Q S^{1/k}) dx with K=Q(ξ)\mathbb{K}=\mathbb{Q}(ξ), ξξ a primitive kkth root of unity, P,Q,S∈K[x]P,Q,S\in\mathbb{K}[x] and SS has simple roots and degree coprime with kk. Note dd the maximum of the degree of P,Q,SP,Q,S, hh the logarithmic height of the coefficients and gg the genus of yk−S(x)y^k-S(x). We present an algorithm which solves the elementary integration problem of II generically in O((kd)ω+2g+1hg+1)O((kd)^{ω+2g+1} h^{g+1}) operations.

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