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  1. Decomposition and infima in the computably enumerable degrees.Rodney G. Downey, Geoffrey L. Laforte & Richard A. Shore - 2003 - Journal of Symbolic Logic 68 (2):551-579.
    Given two incomparable c.e. Turing degrees a and b, we show that there exists a c.e. degree c such that c = (a ⋃ c) ⋂ (b ⋃ c), a ⋃ c | b ⋃ c, and c < a ⋃ b.
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  • Computability theory and linear orders.Rod Downey - 1998 - In I͡Uriĭ Leonidovich Ershov (ed.), Handbook of Recursive Mathematics. Elsevier. pp. 138--823.
     
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