Geodesic
Isomorphism types of Rogers semilattices for families from different levels of the arithmetical hierarchy
Algebra i logika, Tome 45 (2006) no. 6, pp. 637-654

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We investigate differences in isomorphism types for Rogers semilattices of computable numberings of families of sets lying in different levels of the arithmetical hierarchy.
Keywords: arithmetical hierarchy, computable numbering, Rogers semilattice. 
@article{AL_2006_45_6_a0,
     author = {S. A. Badaev and S. S. Goncharov and A. Sorbi},
     title = {Isomorphism types of {Rogers} semilattices for families from different levels of the arithmetical hierarchy},
     journal = {Algebra i logika},
     pages = {637--654},
     publisher = {mathdoc},
     volume = {45},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2006_45_6_a0/}
}
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S. A. Badaev; S. S. Goncharov; A. Sorbi. Isomorphism types of Rogers semilattices for families from different levels of the arithmetical hierarchy. Algebra i logika, Tome 45 (2006) no. 6, pp. 637-654. http://geodesic.mathdoc.fr/item/AL_2006_45_6_a0/