Katsushi Ito †

We discuss the N = 2 super W algebras from the hamiltonian reduction of affine Lie superalgebras A(n|n− 1) and A(n|n)(1). From the quantum hamiltonian reduction of A(n|n− 1) we get the free field realization of N = 2 CPn super coset models. In the case of the affine Lie superalgebras A(n|n)(1), the corresponding conformal field theories do not have N = 2 superconformal symmetry. However we show that these models are twisted N = 2 CPn models and may be regarded as topological conformal field theories. To appear in the proceedings of the International Workshop on “String Theory, Quantum Gravity and the Unification of Fundamental Interactions” Rome, September 21–26, 1992 Address after March 1, 1993: Institute of Physics, University of Tsukuba, Ibaraki 305, Japan