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...combine a [[polynomial]] approximation (such as a [[Taylor series]] or a [[rational function]]) with a table lookup — they first look up the closest angle in a sm

...values of the standard normal CDF using [[piecewise]] approximations by [[rational function]]s. Another approximation method uses third-degree polynomials on intervals

<math>L\!=\!\mathrm{e}</math>. Tetration approaches this limiting value as rational function.