Abstract
Recently, a D-brane construction in type IIA string theory was shown to yield the electric/magnetic duality of four-dimensional N = 1 supersymmetric U( N c ) gauge theories with N f flavours of quark. We present here an extension of that construction which yields the electric/magnetic duality for the SO( N c ) and USp( N c ) gauge theories with N f quarks, by adding an orientifold plane which is consistent with the supersymmetry. Due to the intersection of the orientifold plane with the NS-NS fivebranes already present, new features arise which are crucial in determining the correct final structure of the dualities.
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