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Reference.org
Lanczos approximation
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, the Lanczos approximation is a method for computing the <a href="/facts/Gamma_function/SjGQcnyw">gamma function</a> numerically, published by <a href="/facts/Cornelius_Lanczos/FRqrbJIb">Cornelius Lanczos</a> in 1964. It is a practical alternative to the more popular <a href="/facts/Stirling%27s_approximation/GfxV3BUH">Stirling's approximation</a> for calculating the gamma function with fixed precision. </p>