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Keywords:
Lindelöf space; Souslin number; spread; extent; pseudocharacter; relative cardinal invariant
Lindelöf space; Souslin number; spread; extent; pseudocharacter; relative cardinal invariant
Summary:
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.
References:
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