Geodesic
Constructive properties of functions with variable smoothness
Matematičeskie zametki, Tome 8 (1970) no. 4, pp. 443-449.

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

Analogs of theorems of Jensen and Weierstrass are proven for functions of variable smoothness, defined on the real line. 
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     author = {V. Ya. Yanchak},
     title = {Constructive properties of functions with variable smoothness},
     journal = {Matemati\v{c}eskie zametki},
     pages = {443--449},
     publisher = {mathdoc},
     volume = {8},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_8_4_a3/}
}
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V. Ya. Yanchak. Constructive properties of functions with variable smoothness. Matematičeskie zametki, Tome 8 (1970) no. 4, pp. 443-449. http://geodesic.mathdoc.fr/item/MZM_1970_8_4_a3/