TOPICAL REVIEW: The Hopf algebra approach to Feynman diagram calculations

  title={TOPICAL REVIEW: The Hopf algebra approach to Feynman diagram calculations},
  author={Kurusch Ebrahimi-Fard and Dirk Kreimer},
  journal={Journal of Physics A},
Two directional measuring device having an elongate measuring member having a distance measuring scale along its length and another measuring member to measure distance in another direction. The two members are relatively moveable in the direction of the measuring scale of the elongate member and the other member has diverging surfaces extending generally in that direction and a distance measuring scale to indicate, at spaced positions, the distance apart of the diverging surfaces. 
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