public static interface ContinuedFraction.Partials
This interface defines a continued fraction in terms of
the partial numerators an, and the partial denominators bn.
\[
z = b_0 + \cfrac{a_1}{b_1 + \cfrac{a_2}{b_2 + \cfrac{a_3}{b_3 + \cfrac{a_4}{b_4 + \ddots\,}}}}
\]