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- W4382322722 abstract "In 1939 Tur'{a}n raised the question about lower estimations of the maximum norm of the derivatives of a polynomial $p$ of maximum norm $1$ on the compact set $K$ of the complex plain under the normalization condition that the zeroes of $p$ in question all lie in $K$. Tur'{a}n studied the problem for the interval $I=[-1,1]$ and the unit disk $D$ and found that with $n$ denoting the degree of $p$ and with $n$ tending to infinity, the precise growth order of the minimal possible derivative norm (oscillation order) is $sqrt{n}$ for $I$ and $n$ for $D$. ErH{o}d continued the work of Tur'{a}n considering other domains. Finally, in 2006, Hal'{a}sz and R'{e}v'{e}sz proved that the growth of the minimal possible maximal norm of the derivative is of order $n$ for all compact convex domains. Although Tur'{a}n himself gave comments about the above oscillation question in $L^q$ norms, till recently results were known only for $D$ and $I$. Recently, we have found order $n$ lower estimations for several general classes of compact convex domains, and proved that in $L^q$ norm the oscillation order is at least $n/log n$ for all compact convex domains. In the present paper we prove that the oscillation order is not greater than $n$ for all compact (not necessarily convex) domains $K$ and $L^q$-norm with respect to any measure supported on more than two points on $K$." @default.
- W4382322722 created "2023-06-28" @default.
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- W4382322722 date "2023-06-25" @default.
- W4382322722 modified "2023-09-25" @default.
- W4382322722 title "The growth order of the optimal constants in Tur'{a}n-ErH{o}d type inequalities in $L^q(K,mu)$" @default.
- W4382322722 doi "https://doi.org/10.48550/arxiv.2306.14315" @default.
- W4382322722 hasPublicationYear "2023" @default.
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