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Date: 11-2-2016
1056
Date: 16-2-2016
1661
Date: 24-11-2021
1250
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Let be integrable in , let be of bounded variation in , let denote the least upper bound of in , and let denote the total variation of in . Given the function
(1) |
then the terms of its Fourier-Legendre series
(2) |
(3) |
where is a Legendre polynomial, satisfy the inequalities
(4) |
for (Sansone 1991).
REFERENCES:
Picone, M. Appunti di Analise Superiore. Naples, Italy,, p. 260, 1940.
Sansone, G. Orthogonal Functions, rev. English ed. New York: Dover, pp. 203-205, 1991.
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