Construction of interpolation splines minimizing the semi-norm in the space $K_2(P_m)$

Abstract

In the present paper, using S.L. Sobolev's method, interpolation spline that minimizes the expression $\int_0^1(φ^{(m)}(x)+ω^2φ^{(m-2)}(x))^2dx$ in the $K_2(P_m)$ space are constructed. Explicit formulas for the coefficients of the interpolation splines are obtained. The obtained interpolation spline is exact for monomials $1,x,x^2,..., x^{m-3}$ and for trigonometric functions $\sinωx$ and $\cosωx$.