= Roberto Moriyón
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<Roberto Moriyón> worked with <Rafael de la Llave> and <José Manuel Marco> on canonical perturbation methods and regularity for the Livšic <cohomological equation>.<Canonical perturbation theory of Anosov systems and regularity results for the Livsic cohomology equation by Rafael de la Llave and others (1986)>[Official byline and article subject]{ref}
In a hyperbolic setting, periodic trajectories impose compatibility conditions on the equation's data. Understanding when compatible data yield smooth transfer functions links <dynamical systems>, geometric rigidity and <analysis>.
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