Data:K12a1119/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^4-9 t^3+21 t^2-33 t+39-33 t^{-1} +21 t^{-2} -9 t^{-3} +2 t^{-4} }