Data:L11a238/Multivariable Alexander

[math]\displaystyle{ -v^2 u^4+2 v u^4-u^4+5 v^2 u^3-8 v u^3+4 u^3-7 v^2 u^2+11 v u^2-7 u^2+4 v^2 u-8 v u+5 u-v^2+2 v-1 }[/math]