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In mathematics, Stirling's approximation (or Stirling's formula) is an approximation for factorials. It is a good approximation, leading to accurate results even for small values of . It is named after James Stirling, though a related but less precise result was first stated by Abraham de Moivre. The version of the formula typically used in applications is

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  • Stirling's approximation (en)
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  • In mathematics, Stirling's approximation (or Stirling's formula) is an approximation for factorials. It is a good approximation, leading to accurate results even for small values of . It is named after James Stirling, though a related but less precise result was first stated by Abraham de Moivre. The version of the formula typically used in applications is (en)
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  • In mathematics, Stirling's approximation (or Stirling's formula) is an approximation for factorials. It is a good approximation, leading to accurate results even for small values of . It is named after James Stirling, though a related but less precise result was first stated by Abraham de Moivre. The version of the formula typically used in applications is (in Big Theta notation, as ), or, by changing the base of the logarithm (for instance in the worst-case lower bound for comparison sorting), Specifying the constant in the O(ln n) error term gives 1/2ln(2πn), yielding the more precise formula:where the sign ~ means that the two quantities are asymptotic: their ratio tends to 1 as tends to infinity. The following version of the bound holds for all , rather than only asymptotically: (en)
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