I found a bug in a limit evaluation: sage: f = sqrt(1-x^2) sage: g = diff(f, x); g -x/sqrt(1 - x^2) sage: limit(g, x=1, dir='below') +Infinity
It's a semicircle, so the derivative should go to negative infinity on the right side. I'd file a trac ticket, but I'm not sure if this is known, or if there's much we can do about it. (I'm guessing it's a Maxima bug, which might be fixed in a newer version.) Dan -- --- Dan Drake <[EMAIL PROTECTED]> ----- KAIST Department of Mathematical Sciences ------- http://math.kaist.ac.kr/~drake
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