Axial-vector duality as a mirror symmetry

We study N = 2 supersymmetric SU (2)U (1) and SL(2, R)U (1) gauged Wess-Zumino-Witten models. It is shown that the vector gauged model is transformed to the axial gauged model by a mirror transformation. Therefore the vector gauged model and the axial gauged model are equivalent as N = (2,2) superconformal field theories. In the SL(2, R)U (1) model, it is known that axial-vector duality relates a background with a singularity to one without a singularity. Implications of the equivalence of these two models to space-time singularities are discussed.