Geodesic
Differentiation with respect to nets and the Haar series
Matematičeskie zametki, Tome 4 (1968) no. 1, pp. 33-40.

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

We set out the connection between convergence of the Haar series and differentiation with respect to nets of a function. This connection allows us to give a new proof of certain earlier theorems on Haar series, and also to prove a number of new generalizations. 
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     author = {V. A. Skvortsov},
     title = {Differentiation with respect to nets and the {Haar} series},
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V. A. Skvortsov. Differentiation with respect to nets and the Haar series. Matematičeskie zametki, Tome 4 (1968) no. 1, pp. 33-40. http://geodesic.mathdoc.fr/item/MZM_1968_4_1_a3/