On small homotopies of loops

Details On small homotopies of loops On small homotopies of loops

2007-12-11

arxiv.org/abs/0712.1722v1

Topol. Appl. 155:10 (2008), 1089-1097

Mathematics

Geometric Topology

12 pages, 5 figures

Scientific paper

10.1016/j.topol.2008.01.009

Two natural questions are answered in the negative: (1) If a space has the property that small nulhomotopic loops bound small nulhomotopies, then are loops which are limits of nulhomotopic loops themselves nulhomotopic? (2) Can adding arcs to a space cause an essential curve to become nulhomotopic? The answer to the first question clarifies the relationship between the notions of a space being homotopically Hausdorff and $\pi_1$-shape injective.

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