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In mathematics, a Lidstone series, named after George James Lidstone, is a kind of polynomial expansion that can expressed certain types of entire functions. Let ''ƒ''(''z'') be an entire function of exponential type less than (''N'' + 1)''π'', as defined below. Then ''ƒ''(''z'') can be expanded in terms of polynomials ''A''''n'' as follows: : Here ''A''''n''(''z'') is a polynomial in ''z'' of degree ''n'', ''C''''k'' a constant, and ''ƒ''(''n'')(''a'') the ''n''th derivative of ''ƒ'' at ''a''. A function is said to be of exponential type of less than ''t'' if the function : is bounded above by ''t''. Thus, the constant ''N'' used in the summation above is given by : with : ==References== * Ralph P. Boas, Jr. and C. Creighton Buck, ''Polynomial Expansions of Analytic Functions'', (1964) Academic Press, NY. Library of Congress Catalog 63-23263. Issued as volume 19 of ''Moderne Funktionentheorie'' ed. L.V. Ahlfors, series ''Ergebnisse der Mathematik und ihrer Grenzgebiete'', Springer-Verlag ISBN 3-540-03123-5 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Lidstone series」の詳細全文を読む スポンサード リンク
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