Approximation theory

Daghestan Electronic Mathematical Reports: Issue 4 (2015)

Splines on rational interpolants

UDK: 517.5

Pages: 21 - 30

For a function continuous on a given interval (or periodic) we construct $n$-point ($n=2,3,4$) rational interpolants and rational splines by means of of these interpolants. The sequences of the splines by the $n$-point interpolants for $n = 2$ and $n=3$ converges uniformly on the entire interval to the function itself for any sequence of grids with a diameter tending to zero. For $n= 3$ this property of unconditional convergence is also transmitted to the first derivatives, and for $n = 4$ - to the first and second derivatives. We also give estimates of the convergence rate.

Keywords: splines, interpolation rational splines, unconditional convergence.

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