House with two rooms
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]
A 3D model of Bing's house
3D model of Bing's house with front and rear walls removed
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
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.
References
- 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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