  In this article, an introduction to the nonlinear equations for completely
symmetric bosonic higher spin gauge fields in anti de Sitter space of any
dimension is provided. To make the presentation self-contained we explain in
detail some related issues such as the MacDowell-Mansouri-Stelle-West
formulation of gravity, unfolded formulation of dynamical systems in terms of
free differential algebras and Young tableaux symmetry properties in terms of
Howe dual algebras.
