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most citedBig symplectic or orthogonal monodromy modulo l

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math.GR2008

Monodromy Groups of Hurwitz-type Problems

Daniel Allcock, Chris Hall

We solve the Hurwitz monodromy problem for degree-4 covers. That is, the Hurwitz space H_{4,g} of all simply branched covers of P^1 of degree 4 and genus g is an unramified cover o…