Geodesic
A~jump inversion theorem for the semilattices of $\Sigma$-degrees
Sibirskie èlektronnye matematičeskie izvestiâ, Tome 6 (2009), pp. 182-190.

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For the semilattices of $\Sigma$-degrees of structures, we prove an analogue of the jump inversion theorem. As a corollary, we get similar result for the semilattices of degrees of of presentability of countable structures.
Keywords: computability, computable structures, admissible sets. 
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A. I. Stukachev. A~jump inversion theorem for the semilattices of $\Sigma$-degrees. Sibirskie èlektronnye matematičeskie izvestiâ, Tome 6 (2009), pp. 182-190. http://geodesic.mathdoc.fr/item/SEMR_2009_6_a8/

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