Figure-eight knot
= Figure-eight knot
{title2=$4_1$}
{wiki}
The figure-eight knot is the unique knot of <crossing number of a knot> four. It is prime, alternating, and has <Alexander polynomial of a knot> $-t+3-t^{-1}$ up to a unit.
= Figure-eight knot
{title2=$4_1$}
{wiki}
The figure-eight knot is the unique knot of <crossing number of a knot> four. It is prime, alternating, and has <Alexander polynomial of a knot> $-t+3-t^{-1}$ up to a unit.