A new polynomial invariant of knots and links

@article{Freyd1985ANP,
  title={A new polynomial invariant of knots and links},
  author={Peter J. Freyd and David N. Yetter and Jimmy-John O. E. Hoste and W. B. R. Lickorish and Kenneth C. Millett and Adrian Ocneanu},
  journal={Bulletin of the American Mathematical Society},
  year={1985},
  volume={12},
  pages={239-246}
}
The purpose of this note is to announce a new isotopy invariant of oriented links of tamely embedded circles in 3-space. We represent links by plane projections, using the customary conventions that the image of the link is a union of transversely intersecting immersed curves, each provided with an orientation, and undercrossings are indicated by broken lines. Following Conway [6], we use the symbols L+, Lo, L_ to denote links having plane projections which agree except in a small disk, and… 
A polynomial invariant of knots and links
The purpose of this note is to announce a new isotopy invariant of oriented links of tamely embedded circles in 3-space. We represent links by plane projections, using the customary conventions that
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