, Volume 28, Issue 5, pp 595-623

First online:

Graph-like continua, augmenting arcs, and Menger’s theorem

  • Carsten ThomassenAffiliated withDepartment of Mathematics, Technical University of Denmark Email author 
  • , Antoine VellaAffiliated withRoom D1464, UNODC, Vienna International Centre

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We show that an adaptation of the augmenting path method for graphs proves Menger’s Theorem for wide classes of topological spaces. For example, it holds for locally compact, locally connected, metric spaces, as already known. The method lends itself particularly well to another class of spaces, namely the locally arcwise connected, hereditarily locally connected, metric spaces. Finally, it applies to every space where every point can be separated from every closed set not containing it by a finite set, in particular to every subspace of the Freudenthal compactification of a locally finite, connected graph. While closed subsets of such a space behave nicely in that they are compact and locally connected (and therefore locally arcwise connected), the general subspaces do not: They may be connected without being arcwise connected. Nevertheless, they satisfy Menger’s Theorem.

Mathematics Subject Classification (2000)

05C10 57M15