Geodesic
On approximation with given accuracy of functions of $k$-valued logic by polynomials
Diskretnaya Matematika, Tome 20 (2008) no. 2, pp. 32-45.

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We consider approximations of functions of $k$-valued logic by polynomials with various accuracies and find estimates of the ranks and the lengths of the approximating polynomials depending of the accuracy of approximation. 
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S. N. Selezneva. On approximation with given accuracy of functions of $k$-valued logic by polynomials. Diskretnaya Matematika, Tome 20 (2008) no. 2, pp. 32-45. http://geodesic.mathdoc.fr/item/DM_2008_20_2_a3/

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[2] Yablonskii S. V., Vvedenie v diskretnuyu matematiku, Nauka, Moskva, 1986 | MR | Zbl