On certain permutation groups and sums of two squares
Geometric Topology
2008-10-06 v1 Number Theory
Abstract
We 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.
Cite
@article{arxiv.0810.0591,
title = {On certain permutation groups and sums of two squares},
author = {Pietro Corvaja and Carlo Petronio and Umberto Zannier},
journal= {arXiv preprint arXiv:0810.0591},
year = {2008}
}
Comments
14pages