The Lie algebras opened a vast field of applications in physics, differential equations, differential geometry, linear algebra and abstract algebra. Below is a demonstration of the Engel�s theorem. This theorem is one of the foundations of the theory of Lie algebras and, in itself corresponds to a general property of linear algebra. In particular Engel�s theorem states that a set of linear nilpotent transformations in a finite dimensional vector space closed for the Lie bracket has a common eigenvector associated to the eigenvalue zero.Las álgebras de Lie abrieron un basto campo de aplicaciones en la física, las ecuaciones diferenciales, la geometría diferencial, el álgebra lineal y el álgebra abstracta. A continuación se presenta una demos...