Strongly branched coverings of closed Riemann surfaces

Robert D. M. Accola
1970 Proceedings of the American Mathematical Society  
Let b: Wi->Wi be a B-sheeted covering of closed Riemann surfaces of genera pi and p2 respectively, b is said to be strongly branched if pi>B'pi-\-(B -l)2. If M2 is the function field on W\ obtained by lifting the field from W% to W\, then Mi is said to be
doi:10.1090/s0002-9939-1970-0262485-4 fatcat:iz4cd2lsavbtrn66l5curjizne