Displaying similar documents to “Intersections of ANR's”

Polyhedra with virtually polycyclic fundamental groups have finite depth

Danuta Kołodziejczyk (2007)

Fundamenta Mathematicae

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The notions of capacity and depth of compacta were introduced by K. Borsuk in the seventies together with some open questions. In a previous paper, in connection with one of them, we proved that there exist polyhedra with polycyclic fundamental groups and infinite capacity, i.e. dominating infinitely many different homotopy types (or equivalently, shapes). In this paper we show that every polyhedron with virtually polycyclic fundamental group has finite depth, i.e., there is a bound...

Polyhedra with finite fundamental group dominate finitely many different homotopy types

Danuta Kołodziejczyk (2003)

Fundamenta Mathematicae

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In 1968 K. Borsuk asked: Does every polyhedron dominate only finitely many different shapes? In this question the notion of shape can be replaced by the notion of homotopy type. We showed earlier that the answer to the Borsuk question is no. However, in a previous paper we proved that every simply connected polyhedron dominates only finitely many different homotopy types (equivalently, shapes). Here we prove that the same is true for polyhedra with finite fundamental group.