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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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An invariant of regular isotopy
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by Louis H. Kauffman PDF
Trans. Amer. Math. Soc. 318 (1990), 417-471 Request permission

Abstract:

This paper studies a two-variable Laurent polynomial invariant of regular isotopy for classical unoriented knots and links. This invariant is denoted ${L_K}$ for a link $K$, and it satisfies the axioms: 1. Regularly isotopic links receive the same polynomial. 2. ${L_{[{\text {unk}}]}} = 1$. 3. ${L_{[{\text {unk}}]}} = aL,\qquad {L_{[{\text {unk}}]}} = {a^{ - 1}}L$. 4. ${L_{[{\text {unk}}]}} + {L_{[{\text {unk]}}}} = z({L_{[{\text {unk]}}}} + {L_{[{\text {unk]}}}})$. Small diagrams indicate otherwise identical parts of larger diagrams. Regular isotopy is the equivalence relation generated by the Reidemeister moves of type II and type III. Invariants of ambient isotopy are obtained from $L$ by writhe-normalization.
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Additional Information
  • © Copyright 1990 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 318 (1990), 417-471
  • MSC: Primary 57M25
  • DOI: https://doi.org/10.1090/S0002-9947-1990-0958895-7
  • MathSciNet review: 958895