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MathGroup Archive 1998

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Re: Help please, Agility of Power Series

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14653] Re: Help please, Agility of Power Series
  • From: "W. K. Bertram" <wkb at ansto.gov.au>
  • Date: Sat, 7 Nov 1998 02:10:02 -0500
  • Organization: Australian Nuclear Science and Technology Organisation
  • References: <71q8t7$j07@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Jerry Huang wrote:

> IF a f(x)= the summation of nx^n from 1 to infinity
>
> Find the closed form for f(x) by calculating the result of (1+x)*f(x)
>
>

Can't do your homework for you, but instead of  (1+x)*f(x)try
(1-x)*f(x).

Cheers,
        Bill



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