Conditionally flat functors on spaces and groups

• Published in: Collectanea Mathematica (ISSN: 0010-0757), vol. 66, num. 1, p. 149-160
• Milan: Springer-Verlag Italia Srl, 2015

Consider a fibration sequence of topological spaces which is preserved as such by some functor , so that is again a fibration sequence. Pull the fibration back along an arbitrary map into the base space. Does the pullback fibration enjoy the same property? For most functors this is not to be expected, and we concentrate mostly on homotopical localization functors. We prove that the only homotopical localization functors which behave well under pull-backs are nullifications. The same question makes sense in other categories. We are interested in groups and how localization functors behave with respect to group extensions. We prove that group theoretical nullification functors behave nicely, and so do all epireflections arising from a variety of groups.

Keywords: Localization ; Flatness ; Fiberwise localization ; Variety of groups

Reference

• EPFL-ARTICLE-205398
• doi:10.1007/s13348-013-0102-7
• View record in Web of Science

Record created on 2015-02-20, modified on 2017-05-12