Geodesic
Domains of $t$-Functions
Matematičeskie zametki, Tome 73 (2003) no. 4, pp. 573-576.

Voir la notice de l'article provenant de la source Math-Net.Ru

A nonempty and nonconstant partial recursive function such that any function resembling it is recursively isomorphic to it is called a $t$-function. It is proved that the domain of any $t$-function is neither a simple nor a pseudosimple set. 
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N. V. Litvinov. Domains of $t$-Functions. Matematičeskie zametki, Tome 73 (2003) no. 4, pp. 573-576. http://geodesic.mathdoc.fr/item/MZM_2003_73_4_a8/

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