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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