$\Pi^1_1$ Wellfounded Relations

Greg Hjorth

doi:10.1305/ndjfl/1040408611

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Home > Journals > Notre Dame J. Formal Logic > Volume 35 > Issue 4 > Article

Fall 1994 $\Pi^1_1$ Wellfounded Relations

Greg Hjorth

Notre Dame J. Formal Logic 35(4): 542-549 (Fall 1994). DOI: 10.1305/ndjfl/1040408611

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Abstract

If there is a good $\Delta^1_3$ wellordering of the reals, then there is a $\Pi^1_1$ wellfounded relation for which the comparison relation is not projective.