%0 Journal Article %A Dobado González, Antonio %A Peláez Sagredo, José Ramón %A Urdiales, M.T. %T Applicability constraints of the equivalence theorem %D 1997 %@ 0556-2821 %U https://hdl.handle.net/20.500.14352/58729 %X In this work we study the applicability of the equivalence theorem, either for unitary models or within an effective Lagrangian approach. There are two types of limitations: the existence of a validity energy window and the use of the lowest order in the electroweak constants. For the first kind, we consider some methods, based on dispersion theory or the large N limit, that allow us to extend the applicability. For the second, we obtain numerical estimates of the effect of neglecting higher orders in the perturbative expansion. [S0556-2821(97)04421-4]. %~