Square Blocks With Equioscillation in the Pade Walsh And Cf Tables

Cover Square Blocks With Equioscillation in the Pade Walsh And Cf Tables
Square Blocks With Equioscillation in the Pade Walsh And Cf Tables
Lloyd N Trefethen
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The method of constructing this perturbation depends on which approximation problem is being considered. See [12] for the Chebyshev case (quite straightforward) and [8] for CF (tric)c- ier) . For Pad# approximation one could also write down a perturbation argument, but it is unnecessary since the problem of determining coef- ficients is actually linear. Therefore it is as well to obtain Thm. IP as a corollary of the usual Pad^ table derivation via linear algebra. See [1] or [6].
2. Square block
...s The following arguments run the same way for Chebyshev, Fade, or CF; we consider the Fade case for def initeness. Given f, suppose a function r of exact type (ij, v) v;ith p > -• with N v+H for some dropped) .
A ^ (possibly For which (m, n) , in which case the ^ if any, is r the Pad^ approximant r : The answer is, for precisely those {m, n) that lie in any of the posi- tions of the following (A+1) x (A+1) block: Figure 1 To verify this claim, combine (4) and (5) to obtain the following condition: r = r^ if and only if m > p, n > v, and U+v+A > m+n-5, or by (3), 5.


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