Abstract

An analog of the Riesz interpolation formula is established. It allows us to obtain a sharp estimate for the first order derivative of a spline of minimal defect with equidistant knots $$ \frac{j\pi}{\sigma },j\in \mathrm{\mathbb{Z}}, $$ in terms of the first order difference in the integral metric. Moreover, the constructed identity makes it possible to strengthen the inequality by replacing its right-hand side with a linear combination of differences, including higher order differences, of the spline. In the case of the difference step $$ \frac{\pi }{\sigma } $$ , iterations of this identity lead to formulas analogous to the Riesz formula for higher order derivatives and differences; this allows us to obtain Riesz and Bernstein type inequalities for them, also in a stronger form.

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