Geodesic
The set of closed classes $P_{k+1}$ that can be homomorphically mapped on $P_k$ has the cardinality of continuum
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2020), pp. 69-70 
L. Yu. Devyatkin. The set of closed classes $P_{k+1}$ that can be homomorphically mapped on $P_k$ has the cardinality of continuum. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2020), pp. 69-70. http://geodesic.mathdoc.fr/item/VMUMM_2020_1_a10/
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     title = {The set of closed classes $P_{k+1}$ that can be homomorphically mapped on $P_k$ has the cardinality of continuum},
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Voir la notice de l'article provenant de la source Math-Net.Ru

We prove that the partially ordered set $\mathcal{L}^{k+1}_{k}$ of all closed classes of $(k+1)$-valued logic which can be homomorphically mapped onto $k$-valued logic has the cardinality of continuum.

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