3 0 0 0 OA A measure theoretic basis theorem for Π21
- 著者
- Hiroshi FUJITA
- 出版者
- 一般社団法人 日本数学会
- 雑誌
- Journal of the Mathematical Society of Japan (ISSN:00255645)
- 巻号頁・発行日
- vol.52, no.2, pp.335-341, 2000 (Released:2007-01-23)
- 参考文献数
- 9
Using the covering game, we prove that every (lightface) Π21-set of positive Lebesgue measure contains a member which is arithmetical in 0^{\#}. This result generalizes a result for Π11 due to Sacks and Tanaka.
- 著者
- Hiroshi Fujita
- 出版者
- Wiley
- 巻号頁・発行日
- 1975