Abstract
We consider the so-called simplest formula for local approximation by polynomial splines of order $ n $ (Schoenberg splines). The spline itself and all derivatives except that of the highest order, approximate a given function and its corresponding derivatives with the second order. We show that the jump of the highest derivative of order $ n-1 $ ; i. e., the value of discontinuity, divided by the meshsize, approximates the $ n $ th derivative of the original function. We found an asymptotic expansion of the jump.
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