Geodesic
On approximation by Lagrange interpolating polynomials for a subset of the space of continuous functions
Colloquium Mathematicum, Tome 75 (1998) no. 1, pp. 1-5.

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We construct a $C^k$ piecewise differentiable function that is not $C^k$ piecewise analytic and satisfies a Jackson type estimate for approximation by Lagrange interpolating polynomials associated with the extremal points of the Chebyshev polynomials.
DOI : 10.4064/cm-75-1-1-5

S. Zhou 1

1 
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S. Zhou. On approximation by Lagrange interpolating polynomials for a subset of the space of continuous functions. Colloquium Mathematicum, Tome 75 (1998) no. 1, pp. 1-5. doi : 10.4064/cm-75-1-1-5. http://geodesic.mathdoc.fr/articles/10.4064/cm-75-1-1-5/

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