Nonsmooth analysis on smooth manifolds

Yu. S. Ledyaev and Q. J. Zhu

Abstract: We study infinitesimal properties of nonsmooth (nondifferentiable) functions on smooth manifolds. The eigenvalue function of a matrix on the manifold of symmetric matrices gives a natural example of such a nonsmooth function.

The subdifferential calculus for lower semicontinuous functions is developed here for studying constrained optimization problems, non-classical problems of calculus of variations, and generalized solutions of first-order partial differential equations on manifolds. We also establish criteria for monotonicity and invariance of functions and sets with respect to solutions of differential inclusions.


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