Notes for AKT-090922/0:03:53

Introducing the Alexander polynomial, (one of the many) definition: i) [math]\displaystyle{ A(O^k) = \delta_{k,1} }[/math] ii) [math]\displaystyle{ A(L_+)-A(L_-)=z A(L_0) }[/math]

i.e. it's a special case of Conway polynomial satisfying a special parametrization.