Robert A. DiPaola. Pseudo-complements and ordinal logics based on consistency statements. The journal of symbolic logic, vol. 31 (1966), pp. 359–364. - Robert A. Dipaola. Some properties of pseudo-complements of recursively enumerable sets. Transactions of the American Mathematical Society, vol. 121 (1966), pp. 296–308.

1972 ◽  
Vol 37 (2) ◽  
pp. 406-406
Author(s):  
J. R. Shoenfield

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