On the asymptotics of the rows of the Padé table of analytic functions with logarithmic branch points

For the functions , where l n and a n are arithmetic progressions and their Padé approximants π n,m ( z; f ), we establish an asymptotics of the decrease of the difference f ( z ) − π n,m ( z; f ) for the case in which z ∈ D = { z : | z | < 1}, m is fixed, and n → ∞. In particular, we obtain prox...

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Veröffentlicht in:Mathematical Notes 2008-10, Vol.84 (3-4), p.379-388
Hauptverfasser: Starovoitov, A. P., Starovoitova, N. A.
Format: Artikel
Sprache:eng
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Zusammenfassung:For the functions , where l n and a n are arithmetic progressions and their Padé approximants π n,m ( z; f ), we establish an asymptotics of the decrease of the difference f ( z ) − π n,m ( z; f ) for the case in which z ∈ D = { z : | z | < 1}, m is fixed, and n → ∞. In particular, we obtain proximate orders of decrease of best uniform rational approximations to the functions ln(1 − z ) and arctan z in the disk D q = { z : | z | ≤ q < 1}.
ISSN:0001-4346
1573-8876
DOI:10.1134/S0001434608090083