Bimorphisms in pro-homotopy and proper homotopy

Volume 160 / 1999

Jerzy Dydak, Francisco Romero Ruiz del Portal Fundamenta Mathematicae 160 (1999), 269-286 DOI: 10.4064/fm-160-3-269-286


A morphism of a category which is simultaneously an epimorphism and a monomorphism is called a bimorphism. The category is balanced if every bimorphism is an isomorphism. In the paper properties of bimorphisms of several categories are discussed (pro-homotopy, shape, proper homotopy) and the question of those categories being balanced is raised. Our most interesting result is that a bimorphism f:X → Y of $tow(H_0)$ is an isomorphism if Y is movable. Recall that $\tow(H_0)$ is the full subcategory of $pro-H_0$ consisting of inverse sequences in $H_0$, the homotopy category of pointed connected CW complexes.


  • Jerzy Dydak
  • Francisco Romero Ruiz del Portal

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