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Summary. Weakly coupled systems of inequalities arise frequently in the consideration of so-called direct methods for shape preserving interpolation. In this paper, a composition based staircase algorithm for bidiagonal systems subject to boundary conditions is developed. Using the compositions of the corresponding relations instead of their projections, we are able to derive a necessary and sufficient...
Abstract. Motivated by earlier considerations of interval interpolation problems as well as a particular application to the reconstruction of railway bridges, we deal with the problem of univariate convexity preserving interval interpolation. To allow convex interpolation, the given data intervals have to be in (strictly) convex position. This property is checked by applying an abstract three-term...
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