Data:L11a180/Multivariable Alexander

[math]\displaystyle{ -v^2 u^4+2 v u^4-u^4+5 v^2 u^3-11 v u^3+6 u^3-9 v^2 u^2+19 v u^2-9 u^2+6 v^2 u-11 v u+5 u-v^2+2 v-1 }[/math]