Re: TI-92 and infinite alternating sums - bug?

To: CALC-TI@LISTS.PPP.TI.COM
Subject: Re: TI-92 and infinite alternating sums - bug?
From: Niklas Brunlid <e96nbr@EFD.LTH.SE>
Date: Wed, 24 Sep 1997 22:32:39 GMT
Organization: Lund Institute of Technology, Sweden
References: <34267cf0.2270111@news.lth.se> <34295044.1ED1@geocities.com>
Reply-To: Niklas Brunlid <e96nbr@EFD.LTH.SE>
Xref: paladin.american.edu bit.listserv.calc-ti:17071

On Wed, 24 Sep 1997 12:39:16 -0500, juanka1@geocities.com wrote:

>Niklas Brunlid wrote:
>>
>> Possible bug?
>>
>> I just tried this:  (1/5)*sum((-4/5)^k,k,0,infinity)  and it returned
>> a formula... approximation gives a non-real result.
>>
>> Yet this sum has a definite value of (1/-4)*(1/(1-(-4/5)))=-5/36
>> according to our book...?

>ok..
>You should read the TI-92 guidebook......

The only mention of the sum() function is in the functions appendix...
Note: I didn't mean the *list function* sum(), but the mathematical
sum function (the big E).


Niklas Brunlid - http://www.efd.lth.se/~e96nbr
PQF Quote follows:

Nanny Ogg never did any housework herself, but she was the cause of
housework in other people.
        -- (Terry Pratchett, Lords and Ladies)

References:

TI-92 and infinite alternating sums - bug?

From: Niklas Brunlid <e96nbr@EFD.LTH.SE>

Re: TI-92 and infinite alternating sums - bug?

From: juanka1@GEOCITIES.COM

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