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Two Recursively Enumerable Sets of Incomparable Degrees of Unsolvability (Solution of Post's Problem, 1944)

Richard M. Friedberg
Proceedings of the National Academy of Sciences of the United States of America
Vol. 43, No. 2 (Feb. 15, 1957), pp. 236-238
Stable URL: http://www.jstor.org/stable/89817
Page Count: 3
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Two Recursively Enumerable Sets of Incomparable Degrees of Unsolvability (Solution of Post's Problem, 1944)
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