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Second-order necessary/sufficient conditions for optimal control problems in the absence of linear structure
A direct Lebeau-Robbiano strategy for the observability of heat-like semigroups
1. | MODAL’X, EA 3454, Bât. G, Université Paris Ouest Nanterre La Défense, 200 Av. de la République, 92001 Nanterre Cedex, France |
This paper also gives geometric lower bounds on the spectral and cost rates for heat, diffusion and Ginzburg-Landau semigroups, including on non-compact Riemannian manifolds, based on $L^2$ Gaussian estimates.
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