As in title,when a function space with compact-open topology has countable chain condition? Are there some sufficient and necessary conditions? Who give some references about this topic?
McCoy and Ntantu [Topological Properties of Spaces of Continuous Functions, Page 68] pointed out that Vidossich had prove that $C_k(X)$ has ccc if $X$ is submetrizable. Who can give a proof of this statement?
Thank you in advance.