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Nous généralisons le théorème de Cobham ([2]), en démontrant qu'une partie infinie de ℕ est reconnaissable en base k (k entier strictement plus grand que un) et reconnaissable dans un système de numération associé à un nombre de Pisot unitaire (ayant une propriété arithmétique supplémentaire) si et seulement si elle est ultimement périodique.
Questo articolo considera una successione di equazioni differenziali a derivate parziali non lineari in forma di divergenza del tipo in un dominio limitato dello spazio -dimensionale; e sono matrici con coefficenti limitati, e è invertibile e la sua matrice inversa ha anche coefficenti limitati. La non linearità è dovuta alla funzione ; la condizione di crescita, la monotonicità e le ipotesi di coercitività sono modellate sul -Laplaciano, , ed assicurano l'esistenza di una soluzione...
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