Geodesic
On a theorem in spline theory
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 48 (2008) no. 2, pp. 206-211 Cet article a éte moissonné depuis la source Math-Net.Ru

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A Hermite spline of third degree is constructed on a three-dimensional simplex. The deviation of its directional derivatives up to the third order is estimated in angle-free terms. The resulting estimates hold for any tetrahedron irrespective of its geometry. 
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Yu. V. Kupriyanova. On a theorem in spline theory. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 48 (2008) no. 2, pp. 206-211. http://geodesic.mathdoc.fr/item/ZVMMF_2008_48_2_a2/

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