Finitedimensional Feynman DiagramsFeature Column Archive
3. mpoint functionsFor any choice of m(not necessarily different) indices i_{1}, ... , i_{m}between 1 and d,define the mpoint function as follows: The mpoint functions are a step towards the ultimate aim of our calculation.They enter at this moment because they can be calculatedby repeated differentiation of Z_{b} For example, note that So the 1point function <v^{i}>is given by Similarly the mpoint function is given by

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