Data:K12a1129/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 2 t^4-7 t^3+13 t^2-19 t+23-19 t^{-1} +13 t^{-2} -7 t^{-3} +2 t^{-4} }