MathSciNet bibliographic data MR2640854 26A03 (11Y60 26D15) Khattri, Sanjay K. Three proofs of the inequality $e<(1+\frac{1}{n})^{n+0.5}$$e<(1+\frac{1}{n})^{n+0.5}$. Amer. Math. Monthly 117 (2010), no. 3, 273–277. Article

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