Support computing Up solutions using HeunC method #43
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This adds support for computing homogeneous solutions satisfying "up" boundary conditions using the HeunC method. The HeunC function in Mathematica does not naturally satisfy "up" boundary conditions. Instead, we can construct an appropriate "up" solution from a linear combination of the two linearly independent solutions$R^{in}(s,l,m)$ and $\Delta(r)^{-s} {}_{-s} \bar{R}^{in}(-s,l,m)$ .