Hi:
I'm not sure if this is a bug or not but just in case,
here is the way diff is behaving for me.
- David Joyner
sage: version()
'SAGE Version 2.8.5, Release Date: 2007-09-21'
sage: R1.<a> = PolynomialRing(QQ)
sage: R2.<x> = PowerSeriesRing(R1)
sage: y = a*x
sage: y.derivative()
a
sage: diff(y,x)
---------------------------------------------------------------------------
<type 'exceptions.TypeError'> Traceback (most recent call last)
/mnt/hd200/sagefiles/sage-2.8.3.rc3/<ipython console> in <module>()
/home/wdj/sagefiles/sage-2.8.3.rc3/local/lib/python2.5/site-packages/sage/calculus/functional.py
in derivative(f, *args, **kwds)
45 """
46 try:
---> 47 return f.derivative(*args, **kwds)
48 except AttributeError:
49 pass
<type 'exceptions.TypeError'>: derivative() takes no arguments (1 given)
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