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- Istituto Nazionale di Fisica Nucleare, Sezione di Roma IIT45 papers
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5 papers · 1 filter
The entangled ergodic theorem in the almost periodic case
Francesco Fidaleo
Let be a unitary operator acting on the Hilbert space , and $\a:\{1,..., 2k\}\mapsto\{1,..., k\}$ a pair partition. Then the ergodic average $$ \frac{1}{N^{k}}\sum_{n_{1},…
Weak mixing properties of vector sequences
L. Zsido
Notions of weak and uniformly weak mixing (to zero) are defined for bounded sequences in arbitrary Banach spaces. Uniformly weak mixing for vector sequences is characterized by mea…
Lindstedt series for periodic solutions of beam equations with quadratic and velocity dependent nonlinearities
Vieri Mastropietro, Michela Procesi
We prove the existence of small amplitude periodic solutions, for a large Lebesgue measure set of frequencies, in the nonlinear beam equation with a weak quadratic and velocity dep…
Tangential dimensions II. Measures
Daniele Guido, Tommaso Isola
Notions of (pointwise) tangential dimension are considered, for measures of R^n. Under regularity conditions (volume doubling), the upper resp. lower dimension at a point x of a me…
Tangential dimensions I. Metric spaces
Daniele Guido, Tommaso Isola
Pointwise tangential dimensions are introduced for metric spaces. Under regularity conditions, the upper, resp. lower, tangential dimensions of X at x can be defined as the supremu…