Une caractérisation des rétractes absolus de voisinage
Tom 144 / 1994
Fundamenta Mathematicae 144 (1994), 11-22
DOI: 10.4064/fm-144-1-11-22
Streszczenie
We prove that a metric space is an ANR if, and only if, every open subset of X has the homotopy type of a CW-complex.
