Hi,
I am puzzled by the following code in sage 7.5:
sage: df = diff(function('f')(x), x); df
diff(f(x), x)
sage: repr(df)
'diff(f(x), x)'
sage: df1 = SR(repr(df)); df1
diff(f(x), x)
df and df1 look the same and we even have
sage: bool(df1 == df)
True
However, they are not identical:
sage: latex(df)
\frac{\partial}{\partial x}f\left(x\right)
sage: latex(df1)
{\rm diff}\left(f\left(x\right), x\right)
sage: df.operator()
D[0](f)
sage: df1.operator()
diff
sage: diff(df, x)
diff(f(x), x, x)
sage: diff(df1, x)
D[0](diff)(f(x), x)*diff(f(x), x) + D[1](diff)(f(x), x)
Any thoughts? Shouldn't SR(repr(df)) always give back df? If not, how to
recover df from repr(df) in the current case?
Eric.
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