International Journal of Mathematics and Mathematical Sciences
Volume 2003 (2003), Issue 56, Pages 3539-3572
doi:10.1155/S0161171203210115
Heegaard splittings and Morse-Smale flows
Ralf Gautschi1
, Joel W. Robbin2
and Dietmar A. Salamon3
1Navigation Support Office, European Space Operations Center, Robert-Bosch Straße 5, Darmstadt D-64293, Germany
2Mathematics Department, University of Wisconsin, Madison 53706, WI, USA
3Department of Mathematics, ETH Zürich, Zürich 8092, Switzerland
Abstract
We describe three theorems which summarize what survives in three dimensions of Smale's proof of the higher-dimensional Poincaré conjecture. The proofs require Smale's cancellation lemma and a lemma asserting the existence of a 2-gon. Such 2-gons are the analogues in dimension two of Whitney disks in higher dimensions. They are also embedded lunes; an (immersed) lune is an index-one connecting orbit in the Lagrangian Floer homology determined by two embedded loops in a 2-manifold.