The two-dimensioanl case leads to a linear equation system similar to
(5.37). The sub-matrix
is
written in the form (5.67). With
constant in each element
is given by
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(5.82) |
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(5.83) |
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(5.84) |
Thus
becomes
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(5.85) |
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(5.86) |
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(5.87) |
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(5.88) |
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(5.89) |
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(5.90) |
For element-wise constant
the entries from
are obtained from
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(5.91) |
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The arrising integrals are solved as follows
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(5.92) |
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(5.93) |
using the integral domain transformation Appendix A. Generally it can be written
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(5.94) |
In a similar manner all entries of
are given
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(5.95) |
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(5.96) |
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(5.97) |
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(5.98) |
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(5.99) |
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(5.100) |
The entries of
are expressed as
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(5.101) |
The entry
is calculated in detail as
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(5.102) |
For the integral terms the integral domain transformation from Appendix A is used again to obtain
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(5.103) |
Thus
is given by
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(5.104) |
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||
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(5.105) |
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(5.106) |
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(5.107) |
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(5.108) |
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(5.109) |
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(5.110) |
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(5.111) |
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(5.112) |
Analogously to (4.49)
for the element matrix
one obtains:
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(5.113) |
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(5.114) |
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(5.115) |
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(5.116) |
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(5.117) |
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(5.118) |