Finite-dimensional Feynman DiagramsFeature Column Archive
3. m-point functionsFor any choice of m(not necessarily different) indices i1, ... , imbetween 1 and d,define the m-point function as follows: The m-point functions are a step towards the ultimate aim of our calculation.They enter at this moment because they can be calculatedby repeated differentiation of Zb For example, note that So the 1-point function <vi>is given by Similarly the m-point function is given by
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