### Martin's Axiom and $\Delta ^2_1$ well-ordering of the reals

by Abraham and Shelah. [AbSh:458]

Archive for Math Logic, 1997

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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