and Super

  title={and Super},
  author={Super and Yang-Mills. and Bobby Samir Acharya},
We geometrically engineer d=4 N=1 supersymmetric Yang-Mills theories by considering M theory on various Joyce orbifolds. We argue that the superpo-tential of these models is generated by fractional membrane instantons. The relation of this superpotential to membrane anomalies is also discussed.