An improved tree-graph bound
Abstract
This report discusses the improved bound of the cluster expansion, recently proposed by Procacci and Yuhjtman (Lett. Math. Phys. 107, 31, 2017). Brydges and Helmuth noticed the relevance of Kruskal's algorithm, which allows to streamline and simplify the argument. These clarifications have proved useful in arXiv:1705.04385.
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