Observability for Schrödinger and heat equations on lattices is equivalent to a local arithmetic condition on the set, revealing a discrete obstruction absent in Euclidean settings.
Haraux, Séries lacunaires et contrôle semi-interne des vibrations d’une plaque rectangulaire.J
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Observable sets for Schr\"odinger equations on combinatorial graphs
Observability for Schrödinger and heat equations on lattices is equivalent to a local arithmetic condition on the set, revealing a discrete obstruction absent in Euclidean settings.