On maps with continuous path lifting
Tom 261 / 2023
Streszczenie
We study a natural generalization of covering projections defined in terms of unique lifting properties. A map $p:E\to X$ has the continuous path-covering property if all paths in $X$ lift uniquely and continuously (rel. basepoint) with respect to the compact-open topology. We show that maps with this property are closely related to fibrations with totally path-disconnected fibers and to the natural quotient topology on the homotopy groups. In particular, the class of maps with the continuous path-covering property lies properly between Hurewicz fibrations and Serre fibrations with totally path-disconnected fibers. We extend the usual classification of covering projections to a classification of maps with the continuous path-covering property in terms of topological $\pi _1$: for any path-connected Hausdorff space $X$, maps $E\to X$ with the continuous path-covering property are classified up to weak equivalence by subgroups $H\leq \pi _1(X,x_0)$ with totally path-disconnected coset space $\pi _1(X,x_0)/H$. Here, weak equivalence refers to an equivalence relation generated by formally inverting bijective weak homotopy equivalences.
