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House with two rooms or Bing's house is a particular contractible, 2-dimensional simplicial complex that is not collapsible. The name was given by R. H. Bing.[1]

The house is made of 2-dimensional panels, and has two rooms. The upper room may be entered from the bottom face, while the lower room may be entered from the upper face. There are two small panels attached to the tunnels between the rooms, which make this simplicial complex to be contractible.
See also

Dogbone space
Dunce hat
List of topologies

External links

Bing's house with two rooms at Info Shako
A 3D model of Bing's house - the model can be visualized by using anaglyph glasses.


Bing, R. H., Some Aspects of the Topology of 3-Manifolds Related to the Poincaré Conjecture, Lectures on Modern Mathematics, Volume 2, 1964

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