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A property of a system of functions close to exponential functions
L. A. Leont'eva Moscow Physicotechnical Institute
Abstract:
We consider the system $\{f_n(x)=x^{\lambda_n}[1+\varepsilon_n(x)]\}$ in the interval $[a,b]$ ($0\leqslant a<b<\infty$). Under certain conditions on $\lambda_n>0$ and $\varepsilon_n(x)$ such as the condition $\varlimsup\limits_{n\to\infty}\frac{\ln m_n}{\lambda_n}>0$, $m_n=||\varepsilon_n(x)||_{L_p[a,b]}$, we obtain a bound for the coefficients of the polynomial $P(x)=\sum c_nf_n(x)$ in terms of $||P(x)||_{L_p[a,b]}$. It is found that this bound is not valid without this condition (assuming the other conditions to remain the same).
Received: 27.11.1970
Citation:
L. A. Leont'eva, “A property of a system of functions close to exponential functions”, Mat. Zametki, 12:1 (1972), 29–36; Math. Notes, 12:1 (1972), 450–454
Linking options:
https://www.mathnet.ru/eng/mzm9843 https://www.mathnet.ru/eng/mzm/v12/i1/p29
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Abstract page: | 136 | Full-text PDF : | 52 | First page: | 1 |
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