Data:K11a201/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^6-2 z^2 a^4+z^4 a^2-2 z^2 a^2-2 a^2+2 z^4+z^2+1+z^4 a^{-2} + a^{-2} -z^2 a^{-4} }