Saturday, May 11, 2019

calculus - Prove that limlimitsnrightarrowinftyleft(1+frac1anright)an=e if limlimitsnrightarrowinftyan=infty


What would be the nicest proof of the following theorem:



If limnan=, then limn(1+1an)an=e.


If limnbn=0, then limn(1+bn)1bn=e.



I somehow failed to find a proof here on the website and in the literature.


Answer




Hint:


(1+1an+1)an(1+1an)an(1+1an)an+1,


and


(1+1n+1)n,(1+1n)n+1e


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