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

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

It is proved that the $d$-rank of an arbitrary $\alpha$-space does not exceed $1$.
Mots-clés : $\alpha$-space
Keywords: $d$-rank. 
@article{AL_2019_58_6_a1,
     author = {Yu. L. Ershov},
     title = {The $d$-rank of an $\alpha$-space does not exceed~$1$},
     journal = {Algebra i logika},
     pages = {706--713},
     publisher = {mathdoc},
     volume = {58},
     number = {6},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2019_58_6_a1/}
}
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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/