Interrelations between some noncontractibility conditions (Q1197531)
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scientific article; zbMATH DE number 91664
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Interrelations between some noncontractibility conditions |
scientific article; zbMATH DE number 91664 |
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Interrelations between some noncontractibility conditions (English)
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16 January 1993
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The authors deal with a theorem of L. Oversteegen, who showed that a fan is not contractible iff either it contains a \(Q\)-point or it is of type \(N\), or it is not pairwise smooth. They investigate different sufficient conditions for non-contractibility of dendroids and fans.
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contractible fans
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\(Q\)-point
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type \(N\)
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dendroids
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fans
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