Naber G.L. Set-Theoretic Topology: With Emphasis on Problems from the Theory of Coverings, Zero Dimensionality and Cardinal Invariants

Department of Mathematical Sciences, Memphis State University, 1977. — 736 p.Set-theoretic topology is a subject that combines set theory and general topology. It focuses on topological questions that are independent of Zermelo–Fraenkel set theory (ZFC).
Cardinal functions are widely used in topology as a tool for describing various topological properties.