Geodesic
On recursively enumerable minimal btt-degrees
Sbornik. Mathematics, Tome 32 (1977) no. 4, pp. 477-487

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It is proved that in the upper semilattice of recursively enumerable btt-degrees, every upper bound of the set of minimal elements coincides with the unit of the semilattice. In any recursively enumerable nonrecursive w-degree there exist sets having minimal m- and btt-degrees. Bibliography: 8 titles. 
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     author = {S. S. Marchenkov},
     title = {On recursively enumerable minimal btt-degrees},
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     number = {4},
     year = {1977},
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     url = {http://geodesic.mathdoc.fr/item/SM_1977_32_4_a5/}
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S. S. Marchenkov. On recursively enumerable minimal btt-degrees. Sbornik. Mathematics, Tome 32 (1977) no. 4, pp. 477-487. http://geodesic.mathdoc.fr/item/SM_1977_32_4_a5/