Baire property of some function spaces

Alexander V. Osipov, Evgenii G. Pytkeev

Published 2022-04-12Version 1

A compact space $X$ is called $\pi$-monolithic if whenever a surjective continuous mapping $f:X\rightarrow K$ where $K$ is a compacta there exists a compacta $T\subseteq X$ such that $f(T)=K$. A topological space $X$ is Baire if the intersection of any sequence of open dense subsets of $X$ is dense in $X$. Let $C_p(X,Y)$ denote the space of all continuous $Y$- valued functions $C(X,Y)$ on a Tychonoff space $X$ with the topology of pointwise convergence. In this paper we have proved that for a totally disconnected space $X$ the space $C_p(X,\{0,1\})$ is Baire iff $C_p(X,K)$ is Baire whenever a $\pi$-monolithic compact space $K$. For a Tychonoff space $X$ the space $C_p(X)$ is Baire iff $C_p(X,L)$ is Baire whenever a Frechet space $L$. We construct a totally disconnected Tychonoff space $T$ such that $C_p(T,M)$ is Baire for a separable metric space $M$ iff M is a Peano continuum. Moreover, the space $T$ such that $C_p(T,[0,1])$ is Baire but $Cp(T,\{0,1\})$ is not.