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