Parametric inductive definitions and recursive operators over the continuum
The boundedness principle in ordinal recursion
Borel equivalence and isomorphism of coanalytic sets
CONTENTSIntroduction...............................................................51. Coanalytic sets and admissible ordinals...............72. The hypothesis of constructibility........................123. Ordinal partitions and non-isomorphic sets.........164. Thin non-isomorphic sets....................................195. The hypothesis of projective determinacy...........226. Further results and open questions....................25References.............................................................28...
On the Borel class of the derived set operator
On the Borel class of the derived set operator. II
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