  A new algebraic method for computing helicity is developed, by discovering a
relationship between helicity of fluid mechanics and algebraic polynomial
invariants of knot theory. We have constructed a topological invariant
$t^{H\left(\mathcal{L}\right)}$ for a link $\mathcal{L}$ of knots, where $H$ is
the helicity of a given fluid and $t$ a formal constant. For oriented knotted
vortex lines, $t^{H}$ satisfies the skein relations of the Kauffman
R-polynomial; for un-oriented knotted lines, $t^{H}$ satisfies the skein
relations of the Kauffman bracket polynomial. Our new algebraic method is to
use skein relations to compute the helicity of a link $\mathcal{L}$ by
algebraic recursion.
