a string world-sheet is a 2-d surface in tex2html_wrap130 . To get it, find the extremal path of a string. The integral to minimze is: tex2html_wrap131 where tex2html_wrap132 = 2 dimensional metric on world sheet.


tex2html_wrap134 tex2html_wrap135 If you take the determinant, you'll get the argument of the integrla of s. so tex2html_wrap136 . D=26 to avoid quantum mechanical problems.

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