Asymptotic Bernstein inequality on lemniscates

In this paper we examine the Bernstein–Markov inequality on special compact subsets of the complex plane, namely on lemniscates. Sharp constants are obtained which involve the Green function of the complement and the density of equilibrium measure of the compact set. Using lemniscates is a useful tool because of the possibility of taking inverse images. The proof also uses so-called peaking polynomials which will be constructed.  2004 Elsevier Inc. All rights reserved