Geodesic
Cardinality of the set of delta-closed classes of functions of а multi-valued logic
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (2018), pp. 22-28

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On the set of functions of $k$-valued logic, a closure under composition operation and light version of inversion operation is considered. The cardinality of the set of all such closed classes is calculated. 
@article{VMUMM_2018_5_a3,
     author = {D. E. Starodubtsev},
     title = {Cardinality of the set of delta-closed classes of functions of {\cyra} multi-valued logic},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {22--28},
     publisher = {mathdoc},
     number = {5},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2018_5_a3/}
}
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D. E. Starodubtsev. Cardinality of the set of delta-closed classes of functions of а multi-valued logic. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 5 (2018), pp. 22-28. http://geodesic.mathdoc.fr/item/VMUMM_2018_5_a3/