Exploració per autor "Xarles Ribas, Xavier"
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Hyperelliptic parametrizations of Q -curves
Bars Cortina, Francesc; González Rovira, Josep; Xarles Ribas, Xavier (2020-07-24)
Article
Accés obertFor a square-free integer N, we present a procedure to compute Q-curves parametrized by rational points of the modular curve X∗0(N) when this is hyperelliptic -
Rational periodic sequences for the Lyness recurrence
Gasull, Armengol; Mañosa Fernández, Víctor; Xarles Ribas, Xavier (2012-02-01)
Article
Accés restringit per política de l'editorial -
Rational periodic sequences for the Lyness recurrence
Gasull Embid, Armengol; Mañosa Fernández, Víctor; Xarles Ribas, Xavier (2010-04-30)
Altres
Accés obertConsider the celebrated Lyness recurrence $x_{n+2}=(a+x_{n+1})/x_{n}$ with $a\in\Q$. First we prove that there exist initial conditions and values of $a$ for which it generates periodic sequences of rational numbers with ...