Obstructions to Embedding and Isotopy in the Metastable Range.
Page 1
C. Kearton (1979)
Mathematische Annalen
Akio Kawauchi (1977)
Inventiones mathematicae
Selman Akbulut (1978)
Inventiones mathematicae
Teruo Nagase, Akiko Shima (2005)
Fundamenta Mathematicae
Let Γ be a 4-chart with at most two crossings. We show that if the closure of the surface braid obtained from Γ is one 2-sphere, then the sphere is a ribbon surface.
John R. Klein (1993)
Mathematische Zeitschrift
Aouina, Mokhtar, Klein, John R. (2004)
Algebraic & Geometric Topology
Frank Harary, Ronald H. Rosen (1976)
Colloquium Mathematicae
Chung-wu Ho (1979)
Mathematische Annalen
Page 1