Data:L11n28/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 a^9-a^9 z^{-1} +z^3 a^7+3 z a^7+a^7 z^{-1} -z^3 a^5+2 a^5 z^{-1} +z^5 a^3+2 z^3 a^3-z a^3-2 a^3 z^{-1} -z^3 a-z a}