Data:L11a237/Multivariable Alexander

[math]\displaystyle{ -v^2 u^4+2 v u^4-u^4+5 v^2 u^3-9 v u^3+5 u^3-8 v^2 u^2+15 v u^2-8 u^2+5 v^2 u-9 v u+5 u-v^2+2 v-1 }[/math]