Geodesic
On equivalent definition of continuous differentiability
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, no. 2 (2006), pp. 39-42 
A. S. Demyshev; V. I. Rodionov. On equivalent definition of continuous differentiability. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, no. 2 (2006), pp. 39-42. http://geodesic.mathdoc.fr/item/IIMI_2006_2_a8/
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     author = {A. S. Demyshev and V. I. Rodionov},
     title = {On equivalent definition of continuous differentiability},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {39--42},
     year = {2006},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2006_2_a8/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Concept of S-differentiable function of some variables are defined. Necessary and sufficient conditions of S-differentiability are proved.