looked like one of the strongest candidates for a counterexample to the 4-dimensional Poincaré Conjecture. In this paper we show that Mazur's example is in fact a true 4-sphere after all. This raises the odds in favour of the 4-dimensional Poincaré Conjecture.
No takes yet. Share an insight, caveat, or question.
E. C. Zeeman (1965) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: