KnowraMartin's axiomLinked fromLinked fromThe 6 pages that link to Martin's axiom, each with the reason it gives.All 6Related 3Compared with 3Descriptive set theoryRelated: It influences cardinal invariants and regularity questions involving sets of reals.Forcing (mathematics)Related: Forcing constructions establish its consistency with ZFC and explore its consequences.Rasiowa–Sikorski lemmaRelated: It generalizes the existence pattern behind the lemma to larger families of dense sets.