= Carl de Boor
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Carl de Boor authored notes on <approximation theory> developing best approximation, <B-splines> and spline interpolation. The notes connect concrete recurrence formulas with structural criteria such as the <Schoenberg–Whitney theorem>. This makes it possible to analyze when a spline representation exists and is unique, rather than relying only on numerical fitting.<Math CS 887: Approximation Theory by Carl de Boor>[B-spline formulas (84)–(86) and theorem (131)]{ref}
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