Data:L9a54/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^6 a^{-2} +4 z^4 a^{-2} -z^4 a^{-4} -2 z^4+a^2 z^2+7 z^2 a^{-2} -2 z^2 a^{-4} -6 z^2+2 a^2+6 a^{-2} -2 a^{-4} -6+a^2 z^{-2} + a^{-2} z^{-2} -2 z^{-2} }