KLEINIAN SINGULARITIES AND THE GROUND RING OF C=1 STRING THEORY

@article{Ghoshal1992KLEINIANSA,
  title={KLEINIAN SINGULARITIES AND THE GROUND RING OF C=1 STRING THEORY},
  author={Debashis Ghoshal and Dileep P. Jatkar and Sunil Mukhi},
  journal={Nuclear Physics},
  year={1992},
  volume={395},
  pages={144-166}
}
We investigate the nature of the ground ring of c = 1 string theory at the special ADE points in the c = 1 moduli space associated to discrete subgroups of SU(2). The chiral ground rings at these points are shown to define the ADE series of singular varieties introduced by Klein. The non-chiral ground rings relevant to closed-string theory are 3 real dimensional singular theory are 3 real dimensional singular varieties obtained as U(1) quotients of the kleinian varieties. The unbroken… 
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