Interrelations between some noncontractibility conditions
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.
scientific article; zbMATH DE number 91664
scientific article