On the hierarchies of Δ20-real numbers

Author: Zheng Xizhong  

Publisher: Edp Sciences

E-ISSN: 1290-385x|41|1|3-25

ISSN: 0988-3754

Source: RAIRO - Theoretical Informatics and Applications, Vol.41, Iss.1, 2007-04, pp. : 3-25

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Abstract