Data:9 40/Alexander 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 t^3-7 t^2+18 t-23+18 t^{-1} -7 t^{-2} + t^{-3} }