But there are no values for m and n that are consistant with assume(n>0,m>0)
and that are also integers and that give anything other than %pi. What does
(n-m)/(n-m) have to do with it?
----- Original Message -----
From: "Richard Fateman" <fateman at cs.berkeley.edu>
To: "'John Pye'" <john.pye at anu.edu.au>; <maxima at math.utexas.edu>
Cc: "'Edwin Woollett'" <woollett at charter.net>
Sent: Tuesday, September 09, 2008 11:56 PM
Subject: Re: [Maxima] integrate returns undefined
> Not so clear a bug.
> (n-m)/(n-m) simplifies to 1.
> But if you know n=m, then you have 0/0. So is it a bug if (n-m)/(n-m) -->
> 1?
>
> Answer: maybe. But not clear :)
>
> RJF
>
>
>> -----Original Message-----
>> From: maxima-bounces at math.utexas.edu
>> [mailto:maxima-bounces at math.utexas.edu] On Behalf Of John Pye
>> Sent: Tuesday, September 09, 2008 6:47 PM
>> To: maxima at math.utexas.edu
>> Cc: Edwin Woollett
>> Subject: Re: [Maxima] integrate returns undefined
>>
>> I can confirm that behaviour; it looks like a clear bug to me.
>>
>> Cheers
>> JP
>>
>> Edwin Woollett wrote:
>> > integrate(..) returns undefined when it
>> > should know the answer.
>> >
>> > (%i1) declare( [ m, n ], integer )$
>> > (%i2) assume ( m > 0, n > 0 )$
>> > (%i3) integrate( cos(m*x)^2, x, 0, 2*%pi );
>> > (%o3) %pi
>> > (%i4) integrate( cos(m*x)*cos(n*x), x, 0, 2*%pi );
>> > Is n - m positive, negative, or zero?
>> >
>> > zero;
>> > (%o4) undefined
>> >
>> > Is this a known bug?
>>
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>
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