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MathGroup Archive 2001

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Re: Re: idiom for recurrence relations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27100] Re: [mg27081] Re: [mg26714] idiom for recurrence relations
  • From: BobHanlon at aol.com
  • Date: Sun, 4 Feb 2001 02:58:26 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Or more generally,

Sum[Fibonacci[n]/x^(n+1), {n, Infinity}]//Simplify // ExpandAll // Simplify

1/(x^2 - x - 1)

%  /.  x -> 10

1/89

Sum[Fibonacci[n]*x^n, {n, Infinity}]//Simplify // ExpandAll // Simplify

-(x/(x^2 + x - 1))

And @@ Table[
    Fibonacci[n] == (D[x/(1-x-x^2), {x, n}]/n! /. x -> 0), {n, 20}]

True


Bob Hanlon

In a message dated 2001/2/3 5:30:21 AM, spiralcenter314 at my-deja.com writes:

>I have done some research on the Golden ratio, though not probably as
>extensive as you.
>
>But this may be pertinent,  1 / 89 = .011235955...
>This has all the fibonacci in it. Which is:
>
>0/(10^1)+
>1/(10^2)+
>1/(10^3)+
>2/(10^4)+
>3/(10^5)+
>5/(10^6)+
>etc...
>


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