Geodesic
Approximation by Λ-Splines on the Circle
Canadian journal of mathematics, Tome 37 (1985) no. 6, pp. 1085-1111

Voir la notice de l'article provenant de la source Cambridge University Press

Let Λ = {λ0,..., λn } denote a set of distinct integers and let Π(Λ) denote the set of all generalized polynomials of the form For any given ζ on the unit circle U with we consider the set Zk of points 1, ζ, ζ 2, ..., ζ k−1 where We shall denote by or the class of Λ-splines S(z) which satisfy the following conditions: (i) S(z) ∊ C n−1(U) (ii) S(z)|Av ∊ Π(Λ) where 
Goodman, T. N. T.; Lee, S. L.; Sharma, A. Approximation by Λ-Splines on the Circle. Canadian journal of mathematics, Tome 37 (1985) no. 6, pp. 1085-1111. doi: 10.4153/CJM-1985-059-9
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