Geodesic
One theorem about strongly $\eta$-representable sets
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (2009), pp. 77-81

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In this paper we consider strongly $\eta$-representable sets. We prove that the union of $\Sigma^0_2$- and $\Pi^0_2$-sets is strongly $\eta$-representable.
Keywords: computability, linear order, strong $\eta$-representability. 
@article{IVM_2009_7_a7,
     author = {M. V. Zubkov},
     title = {One theorem about strongly $\eta$-representable sets},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {77--81},
     publisher = {mathdoc},
     number = {7},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2009_7_a7/}
}
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M. V. Zubkov. One theorem about strongly $\eta$-representable sets. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (2009), pp. 77-81. http://geodesic.mathdoc.fr/item/IVM_2009_7_a7/