Cluster expansion for abstract polymer models

@article{Kotecy1986ClusterEF,
  title={Cluster expansion for abstract polymer models},
  author={Roman Kotecḱy and David Preiss},
  journal={Communications in Mathematical Physics},
  year={1986},
  volume={103},
  pages={491-498}
}
A new direct proof of convergence of cluster expansions for polymer (contour) models is given in an abstract setting. It does not rely on Kirkwood-Salsburg type equations or “combinatorics of trees.” A distinctive feature is that, at all steps, the considered clusters contain every polymer at most once. 
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