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From Dale Erwin <d...@casaerwin.org>
Subject Re: [Possible values for n]
Date Fri, 21 Jun 2013 23:22:52 GMT
I realize that a variable can take any value, but some mathematical 
functions limit the possible values. It's been a long time for me, but I 
thought this particular function was stated as Sigma 1 to n = n*(n + 1) 
/ 2 (where n > 1).  You don't really have a series if n is not > 1.
Or it might have been (where n <> 0).

If you did allow the series to run backward (from 1 to 0) you would get 
Sigma 1 to 0 = 0 * 1 / 2 which evaluates to 0.

Dale Erwin
Jr. 28 de Julio 657, Depto. 03
Magdalena del Mar, Lima 17 PERU
http://leather.casaerwin.org

On 6/21/2013 5:06 PM, Brian Barker wrote:
> At 16:01 21/06/2013 -0500, Dale Erwin wrote:
>> I don't think that n can be zero.
>
> Oh, it can - as can x, y, z, or whatever!  As is well known in 
> mathematics, a variable can take any value.
>
> Brian Barker
>
>
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