Geodesic
On the universality of product for classes of linear functions of two variables
Diskretnaya Matematika, Tome 34 (2022) no. 1, pp. 20-22.

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Earlier, the author introduced the concept of a universal function and proved the existence of universal functions for classes of linear $k$-valued functions of two variables for $k\ge5$. In this paper, we show that the product modulo $k$ is a universal function for the class of linear $k$-valued functions of two variables if and only if $k=6l\pm1$.
Keywords: linear $k$-valued function, generating of functions, universal function, product of variables. 
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A. A. Voronenko. On the universality of product for classes of linear functions of two variables. Diskretnaya Matematika, Tome 34 (2022) no. 1, pp. 20-22. http://geodesic.mathdoc.fr/item/DM_2022_34_1_a1/

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