Data:K11n67/HOMFLYPT Polynomial

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle z^4 a^{-4} -z^4+a^2 z^2-z^2 a^{-2} +3 z^2 a^{-4} -z^2 a^{-6} -4 z^2+2 a^2- a^{-2} +3 a^{-4} - a^{-6} -2}