On Aug 26, 2008, at 12:23 AM, William Stein wrote:
I only meant it as a definition to help clarify the discussion, not as an algorithm. Many thanks for your additional clarification. William
Oh, I misunderstood. If Sage can't take the derivative with respect to a function, I wouldn't be surprised since it isn't a common feature of the various CAS packages I've tried. The Maple code I posted at the start of the thread runs in well less than a second while the built-in Maple code takes about 10s for the same problem because of a poor decision the implementers made. Their code always tries to integrate as the last step even when the DEs can't be integrated so it has to wait for the integration to fail. I think the new pynac code might make implementing some of the things I do easier. I'll see. Cheers, Tim.
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