Note that their solution is a formal power series solution, which will be divergent for some polynomial equations. Divergence is unavoidable because of the mult

Note that their solution is a formal power series solution, which will be divergent for some polynomial equations. Divergence is unavoidable because of the multiplicity of solutions. Journal article here: https://www.tandfonline.com/doi/full/10.1080/00029890.2025.2460966#d1e754 https://www.tandfonline.com/doi/full/10.1080/00029890.2025.2...