Geodesic
Directional differentiability of the maximum function
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 3, pp. 567-575 
O. F. Borisenko; L. I. Minchenko. Directional differentiability of the maximum function. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 3, pp. 567-575. http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_3_a5/
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     author = {O. F. Borisenko and L. I. Minchenko},
     title = {Directional differentiability of the maximum function},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {567--575},
     year = {1983},
     volume = {23},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_3_a5/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Differentiation of a maximum function under connected constraints is considered. Expressions are obtained for the directional derivatives.