Department of Mathematics, University of Michigan, Ann Arbor, Michigan 48109-1092, U.S.A.
Bibliografia
[BLMT] L. Bos, N. Levenberg, P. Milman and B. A. Taylor, Tangential Markov inequalities characterize algebraic submanifolds of $ℝ^n$, Indiana Univ. Math. J., to appear.
[L] G. Lorentz, Approximation of Functions, Holt, Rinehart, and Winston, 1966.
[P] C. Pommerenke, On the derivative of a polynomial, Michigan Math. J. 6 (1959), 373-375.
[R] D. Ragozin, Polynomial approximation on compact manifolds and homogeneous spaces, Trans. Amer. Math. Soc. 150 (1970), 41-53.
[S] A. Sadullaev, An estimate for polynomials on analytic sets, Math. USSR-Izv. 20 (1983), 493-502.