Geodesic
The $d$-rank of an $\alpha$-space does not exceed~$1$
Algebra i logika, Tome 58 (2019) no. 6, pp. 706-713.

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It is proved that the $d$-rank of an arbitrary $\alpha$-space does not exceed $1$.
Mots-clés : $\alpha$-space
Keywords: $d$-rank. 
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Yu. L. Ershov. The $d$-rank of an $\alpha$-space does not exceed~$1$. Algebra i logika, Tome 58 (2019) no. 6, pp. 706-713. http://geodesic.mathdoc.fr/item/AL_2019_58_6_a1/

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