Data:K11n173/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^8 a^{-4} -z^6 a^{-2} +6 z^6 a^{-4} -z^6 a^{-6} -4 z^4 a^{-2} +13 z^4 a^{-4} -5 z^4 a^{-6} -4 z^2 a^{-2} +15 z^2 a^{-4} -7 z^2 a^{-6} +z^2 a^{-8} -2 a^{-2} +7 a^{-4} -4 a^{-6} }