Data:L7a2/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 -a^9 z^{-1} +3 a^7 z+3 a^7 z^{-1} -2 a^5 z^3-4 a^5 z-2 a^5 z^{-1} -a^3 z^3-a^3 z}