Hugh Michael Hilden
Introducing what came to be called Birman-Hilden theory on mapping class groups of surfaces related to those of their branched covers:
Joan S. Birman, Hugh M. Hilden: On the Mapping Class Group of Closed Surfaces as Covering Spaces, in: Advances in the Theory of Riemann Surfaces, Annals of Mathematics Studies 66, Princeton University Press (1971) 81-115 [doi:10.1515/9781400822492-007]
Joan S. Birman, Hugh M. Hilden: On isotopies of homeomorphisms of Riemann surfaces, Annals of Mathematics 97 3 (1973) 424-439 [doi:10.2307/1970830, jstor:1970830]
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