# Crumpled cube

In geometric topology, a branch of mathematics, a **crumpled cube** is any space in **R**^{3} homeomorphic to a 2-sphere together with its interior.^{[1]} Lininger (1965) showed that the union of a crumpled cube and an open 3-ball glued along their boundaries is a 3-sphere.

## References

- ↑ Martin, Joseph (1966). "The sum of two crumpled cubes".
*Michigan Mathematical Journal*.**13**(2): 147–151. doi:10.1307/mmj/1028999538.

- Lininger, Lloyd L. (1965), "Some results on crumpled cubes",
*Transactions of the American Mathematical Society*,**118**: 534–549, doi:10.2307/1993977, ISSN 0002-9947, JSTOR 1993977, MR 0178460

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