Celebratio Mathematica — Birman

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Works connected to Ilya Samuil Kofman

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J. Birman and I. Kofman: “A new twist on Lorenz links,” J. Topol. 2 : 2 (2009), pp. 227–248. MR 2529294 Zbl 1233.57001 article

Twisted torus links are given by twisting a subset of strands on a closed braid representative of a torus link. T-links are a natural generalization given by repeated positive twisting. We establish a one-to-one correspondence between positive braid representatives of Lorenz links and T-links, so Lorenz links and T-links coincide. Using this correspondence, we identify over half of the simplest hyperbolic knots as Lorenz knots. We show that both hyperbolic volume and the Mahler measure of Jones polynomials are bounded for infinite collections of hyperbolic Lorenz links. The correspondence provides unexpected symmetries for both Lorenz links and T-links, and establishes many new results for T-links, including new braid index formulas.