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 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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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}. |
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ISSN: | 0001-4346 1573-8876 |
DOI: | 10.1134/S0001434608090083 |