Geodesic
Best Hausdorff approximations by algebraic polynomials and porosity
Matematičeskie zametki, Tome 59 (1996) no. 5, pp. 692-702

Voir la notice de l'article provenant de la source Math-Net.Ru

For any $b\in(a,a')$, a sharp lower bound for the coefficient of $v$-uniformity of the set of discontinuity points of a function $f$ on the interval $(-b,b)$ is obtained. 
@article{MZM_1996_59_5_a4,
     author = {A. I. Ermakov},
     title = {Best {Hausdorff} approximations by algebraic polynomials and porosity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {692--702},
     publisher = {mathdoc},
     volume = {59},
     number = {5},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_59_5_a4/}
}
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A. I. Ermakov. Best Hausdorff approximations by algebraic polynomials and porosity. Matematičeskie zametki, Tome 59 (1996) no. 5, pp. 692-702. http://geodesic.mathdoc.fr/item/MZM_1996_59_5_a4/