23/02/15 18:21:29.30 ix8IQFwl.net
>>466
つづき
Also, the integrand in Jn is a symmetrical function of x1, . . . , xn; therefore, graphs which differ only by a relabeling of the vertices x1, . . . , xn give
identical contributions to Kn and need not be considered separately.
P31
Next, all admissable graphs with the three vertices x0, x1, x2 are to be drawn.
It is easy to see that there are only two such graphs, that G shown in Fig.1, and the identical graph with x1 and x2 interchanged.
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