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R. M. Friedberg. Two recursively enumerable sets of incomparable degrees of unsolvability (solution of Post's problem, 1944). Proceedings of the National Academy of Sciences of the United States of America, vol. 43 (1957), pp. 236–238.

Published online by Cambridge University Press:  12 March 2014

Hartley Rogers Jr.
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Reviews
Information
The Journal of Symbolic Logic , Volume 23 , Issue 2 , June 1958 , pp. 225 - 226
Copyright
Copyright © Association for Symbolic Logic 1958

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