the Virasoro algebra and to determine the correlation functions of those fields.

Among all the Conformal Field Theories studied by BPZ they singled out what they called Minimal Models as those for which the conformal program is more successful in determining their properties the best. The minimal models, also called Rational Conformal Field Theories (RCFT), are those CFT which contain finite number of primary fields in the operator algebra. For these models the anomalous dimensions of the operators, or equivalently the critical exponents, are known exactly and moreover, their correlations functions can be computed as solutions of special systems of linear differential equations. The underlying phenomenon responsible for such remarkable features is the truncation of the operator algebra, that is, the primary fields form a closed operator algebra.

After the introduction of Quantum Groups by Drinfeld [@drinfeld-jimbo] in the mid-eighties, some CFT theorists realized the relationship between these new algebraic structures and those appearing in the RCFT. In reference [@ags] it was shown that the representation theory of $SL(2,q)$ with $q$ a root of unity provides solutions to the polynomial equations of RCFT, as well as a rather efficient way to compute the duality matrices. The rationality condition is met 