An arbitrary Feynman graph for string field theory interactions is analyzed and the homeomorphism type of the corresponding world sheet surface is completely determined even in the nonorientable cases. Algorithms are found to mechanically compute the topological characteristics of the resulting surface from the structure of the signed oriented graph. Whitney’s permutation‐theoretic coding of graphs is utilized.
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© 1993 American Institute of Physics.
1993
American Institute of Physics
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