Wednesday, 14 May 2014

factorial - Limit of a function not using Stirling's Approximation

I want to compute the following limit:
limn(eFn+1)Fn+1Fn+1!(eFn)FnFn!,



where Fn is the nth Fibonacci number. The limit is easily computed by using Stirling's approximation n!2πn(ne)n:



limn(eFn+1)Fn+1Fn+1!(eFn)FnFn!=limn(eFn+1)Fn+12πFn+1(Fn+1e)Fn+1(eFn)Fn2πFn(Fne)Fn=limnFn+1Fn=1+52.



Is it possible to show this without using Stirling's approximation?

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