Geodesic
Subgradients of Minimal Time Functions Under Minimal Requirements
Journal of convex analysis, Tome 18 (2011) no. 4, pp. 915-947.

Voir la notice de l'article provenant de la source Heldermann Verlag

This paper concerns the study of a broad class of minimal time functions corresponding to control problems with constant convex dynamics and closed target sets in arbitrary Banach spaces. In contrast to other publications, we do not impose any nonempty interior and/or calmness assumptions on the initial data and deal with generally non-Lipschitzian minimal time functions. The major results present refined formulas for computing various subgradients of minimal time functions under minimal requirements in both cases of convex and nonconvex targets. Our technique is based on advanced tools of variational analysis and generalized differentiation.
Classification : 49J52, 49J53, 90C31
Mots-clés : Variational analysis and optimization, minimal time functions, Minkowski gauges, generalized differentiation, subdifferentials, normal cones 
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B. S. Mordukhovich; N. M. Nam. Subgradients of Minimal Time Functions Under Minimal Requirements. Journal of convex analysis, Tome 18 (2011) no. 4, pp. 915-947. http://geodesic.mathdoc.fr/item/JCA_2011_18_4_JCA_2011_18_4_a1/