Quantitative Approximation Theorems for
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Thomas Bagby; Len Bos; Norman Levenberg
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Article
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1996
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Elsevier Science
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English
β 632 KB
Let L(D) be an elliptic linear partial differential operator with constant coefficients and only highest order terms. For compact sets K/R N whose complements are John domains we prove a quantitative Runge theorem: if a function f satisfies L(D) f=0 on a fixed neighborhood of K, we estimate the sup-