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Formula for Stiffness
Formula for Stiffness Matrix Element---II
Figure: FEM 6
If
i
and
j
are not connected in the triangulation, then
. If they are connected, written
and
then
(Figure FEM 5)
Example: Show that
Hint:
is a solution to Laplace's equation for which approximations are exact
Geoffrey Fox
,
Northeast Parallel Architectures Center
at Syracuse University,
gcf@npac.syr.edu
Figure: FEM 6
. If they are connected, written 
and 
then 
(Figure FEM 5)
is a solution to Laplace's
equation for which approximations are exact