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math.GT2010★ 6 cited
Eliashberg's proof of Cerf's theorem
Hansjörg Geiges, Kai Zehmisch
Following a line of reasoning suggested by Eliashberg, we prove Cerf's theorem that any diffeomorphism of the 3-sphere extends over the 4-ball. To this end we develop a moduli-theo…
math.GT2010★ 2 cited
Generalised spin structures on 2-dimensional orbifolds
Hansjörg Geiges, Jesús Gonzalo
Generalised spin structures, or r-spin structures, on a 2-dimensional orbifold Σare r-fold fibrewise connected coverings (also called r-th roots) of its unit tangent bundle STΣ. We…