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Vestnik Moskovskogo Universiteta. Seriya 1. Matematika. Mekhanika, 1982, Number 5, Pages 3–7
(Mi vmumm3554)
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This article is cited in 2 scientific papers (total in 2 papers)
Mathematics
An extremal problem for classes of convolutions that do not increase variation
Nguyen Thi Thien Hoa
Abstract:
We prove the following. Let $\Lambda_1$ and $\Lambda_2$ be variation-diminishing operators of the convolution type and $0<\varepsilon<1$. Then there exists $\widehat{h}$ such that $\|(\Lambda_2\circ\Lambda_1\varepsilon_{0,\widehat{h}})(\cdot)\|_{L_\infty(\mathbf R)}
=\varepsilon$, where $\varepsilon_{0,h}(x)=\operatorname{sign}\sin\frac{\pi x}h$ and for every function $u_0(\cdot)$ with $\|u_0(\cdot)\|_{L_\infty(\mathbf R)}\leq1$ and $\|(\Lambda_2\circ\Lambda_1u_0)(\cdot)\|_{L_\infty(\mathbf R)}\leq\varepsilon$ we have $\|\Lambda_1u_0(\cdot)\|_{L_\infty(\mathbf R)}\leq\|\Lambda_1\varepsilon_{0,\widehat{\mathbf R}}(\cdot)\|_{L_\infty(\mathbf R)}$. This result generalizes a theorem of A. N. Kolmogorov on inequalities for the derivatives and some other like theorems.
Received: 09.02.1981
Citation:
Nguyen Thi Thien Hoa, “An extremal problem for classes of convolutions that do not increase variation”, Vestnik Moskov. Univ. Ser. 1. Mat. Mekh., 1982, no. 5, 3–7
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https://www.mathnet.ru/eng/vmumm3554 https://www.mathnet.ru/eng/vmumm/y1982/i5/p3
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