Accounting hierarchies
โ Scribed by Elaine Henry; Oscar J. Holzmann
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 79 KB
- Volume
- 20
- Category
- Article
- ISSN
- 1044-8136
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
## Abstract We show that there is a model of ZF in which the Borel hierarchy on the reals has length __ฯ__~2~. This implies that __ฯ__~1~ has countable cofinality, so the axiom of choice fails very badly in our model. A similar argument produces models of ZF in which the Borel hierarchy has exactly
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