In this paper we deal with a perturbed algebraic Riccati equation in an infinite dimensional Banach space. Besides the interest in its own right, this class of equations appears, ...
Recently the second two authors characterized quasiperiodic Sturmian words, proving that a Sturmian word is non-quasiperiodic if and only if it is an infinite Lyndon word. Here we...
In this paper we prove that for any infinite word w whose set of factors is closed under reversal, the following conditions are equivalent: (I) all complete returns to palindromes...
Michelangelo Bucci, Alessandro De Luca, Amy Glen, ...
We constructively prove that the partially ordered set of finite permutations ordered by deletion of entries contains an infinite antichain. In other words, there exists an infini...