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Let S_{y}, a subset of S, be a union of boundary elements
and
be sufficiently far from S_{y} that the
inequality
is valid (See Fig.2.5).
Using (2.2), one can evaluate the integral in (2.1)
on S_{y} as follows:



(2.3) 
where M_{i}(O) is a multipole moment centred at O defined as



(2.4) 
Kenichi Yoshida
20010728