On certain permutation groups and sums of two squares

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dc.creatorCorvaja, Pietro
dc.creatorPetronio, Carlo
dc.creatorZannier, Umberto
dc.date2008-10-03
dc.date.accessioned2026-07-07T10:07:26Z
dc.date.available2026-07-07T10:07:26Z
dc.descriptionWe consider the question of existence of ramified covers over P_1 matching certain prescribed ramification conditions. This problem has already been faced in a number of papers, but we discuss alternative approaches for an existence proof, involving elliptic curves and universal ramified covers with signature. We also relate the geometric problem with finite permutation groups and with the Fermat-Euler Theorem on the representation of a prime as a sum of two squares.
dc.description14pages
dc.identifierhttps://arxiv.org/abs/0810.0591
dc.identifierhttp://arxiv.org/abs/0810.0591
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/170637
dc.subjectGeometric Topology
dc.subjectNumber Theory
dc.subject57M12 (Primary); 14H37, 11A41 (Secondary).
dc.titleOn certain permutation groups and sums of two squares
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