
A command to transform the selected LegendreSeries object into a Polynomial object.
We find polynomial coefficients c_{k} such that
Σ_{k=1..numberOfCoefficients} c_{k} x^{k} = Σ_{k=1..numberOfCoefficients} l_{k} P_{k}(x) 
We use the recurrence relation for Legendre polynomials to calculate these coefficients.
© djmw 19990620