Crossings and writhe of flexible and ideal knots

Juin Yan Huang, Pik Yin Lai

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


The data of ideal knots [Nature, 384, 142 (1996)] are reanalyzed and the average crossing number of the ideal knots 〈X〉ideal shows a nonlinear behavior with the essential crossing number C. Supplemented with our Monte Carlo simulations using the bond fluctuation model on flexible knotted polymers, our analysis indicates that 〈X〉ideal varies nonlinearly with both C and the corresponding average crossing number of the flexible knot, which is contrary to previous claims. Our extensive, simulation data on the average crossing number of flexible knots suggest that it varies linearly with the square root of C. Furthermore, our data on the average writhe number (Wr) indicate that various knots are classified into holonomous groups, and (Wr) has a quantized linear increment with C in all four knot groups in our study.

Original languageEnglish
Article number021506
Pages (from-to)215061-215066
Number of pages6
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Issue number2 I
StatePublished - 2001


Dive into the research topics of 'Crossings and writhe of flexible and ideal knots'. Together they form a unique fingerprint.

Cite this