On surface braids of index four with at most two crossings
Teruo Nagase ; Akiko Shima
Fundamenta Mathematicae, Tome 185 (2005), p. 167-193 / Harvested from The Polish Digital Mathematics Library
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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.

Publié le : 2005-01-01
EUDML-ID : urn:eudml:doc:283220 
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Teruo Nagase; Akiko Shima. On surface braids of index four with at most two crossings. Fundamenta Mathematicae, Tome 185 (2005) pp. 167-193. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm188-0-9/