DUALITY OF CHIRAL N=1 SUPERSYMMETRIC GAUGE-THEORIES VIA BRANES

Using a six-orientifold on top of a NS-fivebrane we construct a chiral N = 1 SU(Nc) supersymmetric gauge theory in four dimensions with gaug e group SU(N-c) and matter in the symmetric, antisymmetric and (anti)f undamental representations. Anomaly cancellation is fulfilled by the r equirement of a smooth RR 7-form charge distribution and leads us to t he introduction of 8 half D-sixbranes ending on the NS-fivebrane. We o btain the dual model from branes by a linking number argument. We chec k explicitly the 't Hooft anomaly matching conditions and the map betw een deformations in the original and the dual model.