Celebratio Mathematica

Michael H. Freedman

Topology in dImension 4

Works connected to Joel Hass

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article M. Freed­man, J. Hass, and P. Scott: “Closed geodesics on sur­faces,” Bull. Lon­don Math. Soc. 14 : 5 (1982), pp. 385–​391. MR 0671777 Zbl 0476.​53026