Data:L9a18/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^{-7} -z^3 a^{-5} -z a^{-5} -z^3 a^{-3} -z^3 a^{-1} +a z-z a^{-1} +a z^{-1} - a^{-1} z^{-1} }