Stirling formula is the approximation to $n!$ This is a formula widely used in statistics theorem proofs. However, the detailed proof are often omitted in most textbooks. I digged into the online resources. Among numerous articles and papers, I referred to Marton Balazs and Balint Toth’s “Stirling’s Formula and DeMoivre-Laplace Central Limit Theorem” and Jacek Cichon’s “Stirling Approximation Formula”.
How to Deduce Stirling Formula
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