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On a polynomial inequality of Kolmogoroff's type
Authors:B. D. Bojanov   A. K. Varma
Affiliation:Department of Mathematics, University of Sofia, Blvd. James Boucher 5, 1126 Sofia, Bulgaria ; Department of Mathematics, University of Florida, Gainesville, Florida 32611
Abstract:We prove an inequality of the form

begin{displaymath}|f^{(j)}|^2leq A|f^{(m)}|^2+B|f|^2end{displaymath}

for polynomials of degree $n$ and any fixed $0<j<mleq n$. Here $|cdot|$ is the $L_2$-norm on $(-infty,infty)$ with a weight $e^{-t^2}$. The coefficients $A$ and $B$ are given explicitly and depend on $j,m$ and $n$ only. The equality is attained for the Hermite orthogonal polynomials $H_n(t)$.

Keywords:
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