A generic theorem in the theory of cardinal invariants of topological spaces
Aleksander V. Arhangel'skii (1995)
Commentationes Mathematicae Universitatis Carolinae
Similarity:
Relative versions of many important theorems on cardinal invariants of topological spaces are formulated and proved on the basis of a general technical result, which provides an algorithm for such proofs. New relative cardinal invariants are defined, and open problems are discussed.