Martin's Axiom and Delta²₁ well-ordering of the reals
classification
🧮 math.LO
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deltakapparealswell-orderingalephassumingaxiomcardinal
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Assuming an inaccessible cardinal kappa, there is a generic extension in which MA + 2^{aleph_0} = kappa holds and the reals have a Delta^2_1 well-ordering.
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