Geodesic
Analogue of A. A. Markov's inequality for polynomials in two variables
Sbornik. Mathematics, Tome 199 (2008) no. 9, pp. 1409-1420 Cet article a éte moissonné depuis la source Math-Net.Ru

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A sharp estimate is obtained for a partial derivative of any order of polynomials in two variables at points outside the unit ball in $l_2^2$ for polynomials normed on the Chebyshev grid of points of the unit ball in $l_1^2$. Bibliography: 8 titles. 
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V. I. Skalyga. Analogue of A. A. Markov's inequality for polynomials in two variables. Sbornik. Mathematics, Tome 199 (2008) no. 9, pp. 1409-1420. http://geodesic.mathdoc.fr/item/SM_2008_199_9_a3/

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[6] V. I. Skalyga, “Bounds for the derivatives of polynomials on centrally symmetric convex bodies”, Izv. Math., 69:3 (2005), 607–621 | DOI | MR | Zbl

[7] G. A. Muñoz, Y. Sarantopoulos, “Bernstein and Markov-type inequalities for polynomials on real Banach spaces”, Math. Proc. Cambridge Philos. Soc., 133:3 (2002), 515–530 | DOI | MR | Zbl

[8] V. I. Skalyga, “Sharpness conditions in multidimensional analogs of V. A. Markov's inequality”, Math. Notes, 80:5–6 (2006), 893–897 | DOI | MR | Zbl