Constructive Field Theory in Zero Dimension

Abstract

In this pedagogical note we propose to wander through five different methods to compute the number of connected graphs of the zero-dimensional ${\varphi }^4$ field theory,in increasing order of sophistication. The note does not contain any new result but may be helpful to summarize the heart of constructive resummations, namely a replica trick and a forest formula.

12 pages,one figure

References in corpus (1)

• Constructive ${\varphi }^4$ field theory without tears

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