Data:L8n7/Multivariable Alexander
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[math]\displaystyle{ \frac{t(1) t(2)-t(1) t(3) t(2)+t(3) t(2)-t(1) t(4) t(2)-t(3)+t(1) t(4)+t(3) t(4)-t(4)}{\sqrt{t(1)} \sqrt{t(2)} \sqrt{t(3)} \sqrt{t(4)}} }[/math]