16 Dec
2010
16 Dec
'10
4:27 p.m.
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$BF|;~!'(B12$B7n(B17$BF|(B($B6b(B) $B>l=j!'ElKLBg3XKL@DMU;3%-%c%s%Q%9M}3XAm9gEo(B1201$B9f<<(B $B#1#5!'#3#0!A(B $BHu8}9,<#{z!JElKLBg3XM}3X8&5f2J!K(B $B%?%$%H%k!'(BOn the degree structures of co-c.e. classes
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$B2#;37<B@(B -- Keita Yokoyama Mathematical Institute, Tohoku University Aoba, Sendai, JAPAN, 980-8578 [email protected]