Geodesic
The Lebesgue constant of local cubic splines with equally-spaced knots
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 20 (2017) no. 4, pp. 445-451 
V. T. Shevaldin; O. Ya. Shevaldina. The Lebesgue constant of local cubic splines with equally-spaced knots. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 20 (2017) no. 4, pp. 445-451. http://geodesic.mathdoc.fr/item/SJVM_2017_20_4_a7/
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that the uniform Lebesgue constant (the norm of a linear operator from $C$ to $C$) of local cubic splines with equally-spaced knots, which preserve cubic polynomials, is equal to $11/9$.

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