00968nam a2200289 i 450099100080856970753620020507173842.0931123s1966 us ||| | eng b10760118-39ule_instLE01302641ExLDip.to Matematicaeng511.3AMS 03DSacks, Gerald E.50334Degrees of unsolvability /Gerald Sacks2nd edPrinceton, N. J. :Princeton Univ. Press,1966ix, 175 p. ;24 cm.Annals of mathematics studies ;551st ed. 1963Recursion theory.b1076011823-02-1728-06-02991000808569707536LE013 03D SAC11 (1966)12013000141787le013-E0.00-l- 01010.i1085524528-06-02Degrees of Unsolvability340517UNISALENTOle01301-01-93ma -engus 01