Resumen de On open maps between dendrites
In this paper we mainly present two results, one dynamical and one topological, about open mappings between dendrites. The dynamical result states that if f is a homeomorphism from a dendrite X onto itself, then the omega limit set of any point of X is either a periodic orbit or a Cantor set. In the latter case, the restriction of f to this omega limit set is an adding machine. The topological result states that if f is an open map from a dendrite X onto a dendrite Y, then there exists n subcontinua X1, X2, ..., Xn of X such that X is the union of them, the intersection of any two of those subcontinua contains at most one element which is a critical point of f and the restriction of f to any set Xi is an open map from Xi onto Y that can be lifted, in a natural way, to a product space Zi x Y, for some compact and zero-dimensional space Zi
