For a box, a x b x c, with tex2html_wrap107 on all sides except one where tex2html_wrap108 .

Solve laplaces equation: with tex2html_wrap109 . Then tex2html_wrap110 so tex2html_wrap111 , tex2html_wrap112 , and tex2html_wrap113 .

checking with B.C.'s you get: tex2html_wrap114 and tex2html_wrap115 . The full solution is then: tex2html_wrap116 where tex2html_wrap117 . The solution can be found for arbitrary B.C.'s by superpositions of this solution.

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