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Versions of Martin’s axiom. (English) Zbl 0571.54005
Handbook of set-theoretic topology, 827-886 (1984).
[For the entire collection see Zbl 0546.00022.]
The author does not give the usual survey of Martin’s axiom and its consequences, but of the place of MA and some of its variants in the pantheon of combinatorial principles. The paper is especially valuable in its careful delineation of some of the most common weakenings and strengthenings of Martin’s axiom.
Reviewer: J.Roitman

54A35 Consistency and independence results in general topology
03E50 Continuum hypothesis and Martin’s axiom