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Discretising the regularised integral equation (3.47) with
piecewise constant shape functions,
one obtains the following equation:

where *S*_{J} is a plane element in *S* and
represents
on *S*_{J}. In (3.80) the right-hand screw
convention is applied to the direction of the integration along
.
We use (3.80) for the direct computation
instead of (3.47). In the similar way
and
are rewritten as

*Ken-ichi Yoshida*

*2001-07-28*