Abstract.
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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Received May 6, 1993
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Abraham, U., Shelah, S. Martin's axiom and \(\Delta^2_1\) well-ordering of the reals . Arch Math Logic 35, 287–298 (1996). https://doi.org/10.1007/s001530050046
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DOI: https://doi.org/10.1007/s001530050046