integrate returns undefined

• Subject: integrate returns undefined
• From: John Pye
• Date: Wed, 10 Sep 2008 11:47:04 +1000

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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