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Abstract: In this pedagogical note we propose to wander through five different methodsto compute the number of connected graphs of the zero-dimensional $\phi^4$field theory,in increasing order of sophistication. The note does not containany new result but may be helpful to summarize the heart of constructiveresummations, namely a replica trick and a forest formula.



Autor: V. Rivasseau

Fuente: https://arxiv.org/



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