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Splines and their properties and applications. A spline is a function defined piecewise by polynomials, and is typically used in interpolating problems.

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Cubic splines convergence?

I am looking for a basic, classical, result on approximating a smooth function using cubic and linear splines. … Is there a reference on the convergence, in some sense, of the splines to the function of interest in terms of the numbers of knots? …
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