ANTI-FIELD FORMALISM AND NON-ABELIAN DUALITY

The act of implementing non-Abelian duality in two dimensional sigma m odels results unavoidably in an additional reducible symmetry. The Bat alin-Vilkovisky formalism is employed to handle this new symmetry. Val uable lessons are learnt here with respect to non-Abelian duality. We emphasise, in particular, the effects of the ghost sector correspondin g to this symmetry on non-Abelian duality.