Topological lax comma categories (Preprint)

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Type: Preprint
National /International: International
Title: Topological lax comma categories
Publication Date: 2025-04-17
Authors: - Maria Manuel Clementino
- Dirk Hofmann
- Rui Rodrigues de Abreu Fernandes Prezado
Abstract:

This paper investigates the interplay between properties of a topological space \( X \), in particular of its natural order, and properties of the lax comma category \( \mathsf{Top}\Downarrow X \), where \( \mathsf{Top} \) denotes the category of topological spaces and continuous maps. Namely, it is shown that, whenever \( X \) is a topological \( \bigwedge \)-semilattice, the canonical forgetful functor \( \mathsf{Top}\Downarrow X \to \mathsf{Top} \) is topological, preserves and reflects exponentials, and preserves effective descent morphisms. Moreover, under additional conditions on \( X \), a characterisation of effective descent morphisms is obtained.

Institution: DMUC 25-14
Online version: http://www.mat.uc.pt...prints/eng_2025.html
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