In geometric topology, a branch of mathematics, the Bing shrinking criterion, introduced by (Bing 1952), is a method for showing that a quotient of a space is homeomorphic to the space.
References
Bing, R. H. (1952), "A homeomorphism between the 3-sphere and the sum of two solid horned spheres", Annals of Mathematics, Second Series 56: 354–362, doi:10.2307/1969804, ISSN 0003-486X
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