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We shall investigate the properties of solutions of second order linear difference equations defined over a discrete Hardy field via canonical valuations.
For every , we produce a set of integers which is -recurrent but not -recurrent. This extends a result of Furstenberg who produced a -recurrent set which is not -recurrent. We discuss a similar result for convergence of multiple ergodic averages. We also point out a combinatorial consequence related to Szemerédi’s theorem.
Existence and uniqueness conditions for solving singular initial and two-point boundary value problems for discrete generalized Lyapunov matrix equations and explicit expressions of solutions are given.
Soit un entier naturel non nul, et une fonction entière de variables complexes. Dans un article précédent, nous avons démontré dans le cas , que si est une solution d’un système de équations aux différences à coefficients polynomiaux dans deux directions différentes, avec une condition restrictive portant sur les équations, alors est le quotient d’un polynôme exponentiel par un polynôme. Dans cet article, nous démontrons ce résultat dans le cas général, et l’analogue pour le cas de...
En réponse à une question de D.W. Masser, nous démontrons que, pour presque tout système d’équations aux différencesoù les et les sont des polynômes non tous nuls et sont -linéairement indépendants, toute solution qui est une fonction entière est le quotient d’un polynôme exponentiel par un polynôme. Nous avons un résultat semblable quand la deuxième équation est remplacée par une équation différentielle .
Dans cette note, nous prouvons l’existence de solutions indéfiniment différentiables d’un système de deux équations aux différences et appliquons la technique utilisée à l’étude des systèmes d’équations linéaires aux dérivées partielles.Dans chaque cas, on montre que les solutions sont les premières composantes des solutions d’un système matriciel que nous étudions.
On s’intéresse aux solutions méromorphes sur d’un système de deux équations
aux différences à coefficients constants et à deux pas récurrents. Lorsqu’on fait varier
ce système, les solutions décrivent une certaine algèbre en
rapport avec les fonctions elliptiques habituelles et celles de deuxième espèce de
Hermite, ainsi que la fonction de Jacobi. Pour un système donné, les solutions
trouvées forment sur le corps des fonctions elliptiques un espace vectoriel de dimension
finie, en rapport...
We obtain solutions to some conjectures about the nonlinear difference equation
More precisely, we get not only a condition under which the equilibrium point of the above equation is globally asymptotically stable but also a condition under which the above equation has a unique positive cycle of prime period two. We also prove some further results.
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