A DIRECT LEBEAU-ROBBIANO STRATEGY FOR THE OBSERVABILITY OF HEAT-LIKE SEMIGROUPS Dedicated to David L. Russell on the occasion of his 70th birthday


This paper generalizes and simplifies abstract results of Miller and Seidman on the cost of fast control/observation. It deduces final-observability of an evolution semigroup from a spectral inequality, i.e. some stationary observability property on some spaces associated to the generator, e.g. spectral subspaces when the semigroup has an integral… (More)


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