Cardinality of the Set of Delta-Closed Classes of Functions of Multi-Valued Logic / *D. E. Starodubtsev.* // Vestnik Moskovskogo Universiteta. Seriya 1. Matematika. Mekhanika. 2018. № 5. P. 22-28
[Moscow Univ. Math. Bulletin. Vol. 72, N 2, 2017. P. 190-195].

A closure under composition operation and weak version of inversion
operation is considered on the set of functions of *k*-valued logic.
The cardinality of the set of all such closed classes is calculated.

*Key words*:
*k*-valued logic, closed classes, closure operator, inversion operation, extension of composition operation.