Hi,
While testing new integral SFunction class for Sage,
I encountered this weird bug.
----------
sage: f(x) = function('f',x)
sage: f(x).integral(x)
integrate(f(x), x)
sage: f(x).integral(x^2)
x^2*f(x)
-----------
It appears to be a Maxima bug
----------
(%i10) integrate(f(x), x^2);
2
(%o10) x f(x)
----------
However, even "integral" of calculus.py seems to do crazy thing as well.
In line 566, it does
elif not is_SymbolicVariable(v):
v = var(repr(v))
Above imply
--------
sage: v = var(repr(x^2))
sage: v
x^2
sage: v.diff(x)
0
-------
The next commented out line in calculus.py seems to be the right
thing do here!!
Cheers,
Golam
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