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It doesn't make sense to speak of a path integral over a surface. A path or curve is by definition onedimensional; a surface is by definition twodimensional.
Michael Hardy 01:24 Mar 21, 2003 (UTC)
 indeed, must we still use the \oint symbol then?
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Complex
number 
... + i (bc+ad)
Complex numbers were first introduced in connection with explicit formulas for the roots of cubic[?] polynomials. See the section History ... 

