WADGE HIERARCHY OF DIFFERENCES OF CO-ANALYTIC SETS.
We begin the fine analysis of nonBorel pointclasses. Working in ZFC + DET$\left( {_1^1 } \right)$, we describe the Wadge hierarchy of the class of increasing differences of co-analytic subsets of the Baire space by extending results obtained by Louveau ([5]) for the Borel sets.
| Publicado en: | Journal of Symbolic Logic Vol. 81; no. 1; pp. 201 - 216 |
|---|---|
| Autor principal: | |
| Formato: | Artículo |
| Publicado: |
Cambridge University Press
Mar2016
|
| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| Sumario: | We begin the fine analysis of nonBorel pointclasses. Working in ZFC + DET$\left( {_1^1 } \right)$, we describe the Wadge hierarchy of the class of increasing differences of co-analytic subsets of the Baire space by extending results obtained by Louveau ([5]) for the Borel sets. |
|---|