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NonexistenceExistence and non-existence of global solutions for a semilinear heat equationLes méthodes nouvelles de la mécanique céleste. Tome I. Solutions périodiques. Non-existence des intégrales uniformes. Solution...On the non-existence of elements of Hopf invariant oneNon-existence results for the coupled Klein-Gordon-Maxwell equationsExactly solvable model of electronic states in a three-dimensional disordered Hamiltonian: non-existence of localized statesNon-existence of positive solutions of Lane-Emden systemsA criterion for the non-existence of an additional integral in Hamiltonian systems with a homogeneous potentialExistence and non-existence results for semilinear elliptic problems in unbounded domainsOn the Non-Existence of Human Races