ABSTRACT
The number N is the only free parameter both in chiral and gauge theories, because in the continuum limit the coupling constant disappears through dimensional transmutation (remember that the strong coupling expansion referred to the lattice theory and does not give a continuum theory in any finite order). It is very tempting therefore to try to make a 1/N expansion. This will be done in this chapter. As before, our main intention will be to improve our qualitative understanding of dynamics by means of this approximation.
