Shrinking without doing much at all

In 1952 Bing astonished the mathematical world with his wild involution on S 3 .It has been among the most seminal examples in topology.The example depends on finding shrinking homeomorphisms of Bing's decomposition of S 3 into points and arcs.If Bing's original homeomorphisms are varied, Bing's original wild involution changes by conjugation, which preserves some analytic properties while altering others.In 1988, Bing published a second paper, Shrinking without lengthening, answering a question that one of the present authors posed to him in an effort to understand the geometry of the entire conjugacy class.Here we produce a counterintuitive construction, namely a method to shrink the Bing decomposition doing almost nothing at all: neither lengthening much nor rotating much.

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Publication Details

Journal
Algebraic & Geometric Topology
Published
2025-08-11
DOI
https://doi.org/10.2140/agt.2025.25.2099
Primary Topic
Geological formations and processes
Type
article
Field-Weighted Citation Impact
0.00
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article

Shrinking without doing much at all

Michael Starbird, Michael Hartley Freedman
Algebraic & Geometric Topology
Geological formations and processes
article

Shrinking without doing much at all

Michael Starbird, Michael Hartley Freedman
article en

Abstract

In 1952 Bing astonished the mathematical world with his wild involution on S 3 .It has been among the most seminal examples in topology.The example depends on finding shrinking homeomorphisms of Bing's decomposition of S 3 into points and arcs.If Bing's original homeomorphisms are varied, Bing's original wild involution changes by conjugation, which preserves some analytic properties while altering others.In 1988, Bing published a second paper, Shrinking without lengthening, answering a question that one of the present authors posed to him in an effort to understand the geometry of the entire conjugacy class.Here we produce a counterintuitive construction, namely a method to shrink the Bing decomposition doing almost nothing at all: neither lengthening much nor rotating much.

Algebraic & Geometric TopologyVol. 25(4)
University of California, Santa Barbara (US), The University of Texas at Austin (US)
Openalex Percentile: Top 76%
Geological formations and processes
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