Abstract
The theory of the power series solution is applied to the Hamburger DE to derive an improper fraction triplic form, E2 N(x), for ex on the real line. E2 N turns out to be a simpler equivalent to the vertical sequence P2 N of the related Padé table PM N and with comparable summation features.
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Haidar, N.H.S. A Rational Triplic Form for the Exponential. Journal of Computational Analysis and Applications 4, 389–404 (2002). https://doi.org/10.1023/A:1019963928213
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DOI: https://doi.org/10.1023/A:1019963928213