%0 Journal Article
%T On the Nonperturbative Consistency of $d=2$ String Theory
%A Joseph Polchinski
%J Physics
%D 1994
%I arXiv
%R 10.1103/PhysRevLett.74.638
%X An infinite number of distinct $d=1$ matrix models reproduce the perturbation theory of $d=2$ string theory. Due to constraints of causality, however, we argue that none of the existing constructions gives a consistent nonperturbative definition of the $d=2$ string.
%U http://arxiv.org/abs/hep-th/9409168v2