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
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