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In [[mathematics]], a [[topological space]] is said to be '''weakly contractible''' if all of its [[homotopy group]]s are trivial.
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==Property==
It follows from [[Whitehead theorem|Whitehead's Theorem]] that if a [[CW-complex]] is weakly contractible then it is [[contractible]].
 
==Example==
Define <math>S^\infty</math> to be the [[inductive limit]] of the spheres <math>S^n, n\ge 1</math>. Then this space is weakly contractible. Since <math>S^\infty</math> is moreover a CW-complex, it is also contractible.  See [[Contractibility of unit sphere in Hilbert space]] for more.
 
==References==
*{{Springer|id=h/h047940|title=Homotopy type}}
 
{{DEFAULTSORT:Weakly Contractible}}
[[Category:Topology]]
[[Category:Homotopy theory]]
 
 
{{Topology-stub}}

Latest revision as of 04:02, 24 July 2014

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