Altres ajuts: projecte UJI-B2019-18 i BGSMath Banco de Santander Postdoctoral 2017

In this paper we analyse the dynamics of a family of rational operators coming from a fourth-order family of root-finding algorithms. We first show that it may be convenient to redefine the parameters to prevent redundancies and un-boundedness of problematic parameters. After reparametrization, we observe that these rational maps belong to a more general family O of degree n + k operators, which includes several other families of maps obtained from other numerical methods. We study the dynamics of O and discuss for which parameters n and k these operators would be suitable from the numerical point of view.