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19982011
most citedOn certain permutation groups and sums of two squares

2 citations · 7 across the 8 of their papers we have counts for

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Showing 2005 · math.GTShow all

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math.GT2005

On the existence of branched coverings between surfaces with prescribed branch data, I

Ekaterina Pervova, Carlo Petronio

For the existence of a branched covering Sigma~ --> Sigma between closed surfaces there are easy necessary conditions in terms of chi(Sigma~), chi(Sigma), orientability, the total…