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:<math>A_g(z) = c_0 + \sum_{k=1}^{N} \frac{c_k}{z+k}</math>
Thus computing the gamma function becomes a matter of evaluating only a small number of [[elementary function]]s and multiplying by stored constants. The Lanczos approximation was popularized by ''[[Numerical Recipes]]'', according to which computing the gamma function becomes "not much more difficult than other built-in functions that we take for granted, such as sin ''x'' or ''e''<sup>''x''</sup>
==Coefficients==
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