Hi,
I've just been hit by a quite annoying bug, a minimal example of which is
sage: r, b = var('r b', domain='real')
sage: s = function('a', latex_name=r'\alpha')(r)
sage: latex(s)
\alpha\left(r\right)
sage: latex(s.simplify())
a\left(r\right)
sage: s - s.simplify()
a(r) - a(r)
sage: latex(s - s.simplify())
-a\left(r\right) + \alpha\left(r\right)
This occurs both in Sage 8.4 and 8.5.beta3. Notice that the output of
latex(s.simplify()) is not correct ('a' instead of '\alpha') and the output
of s - s.simplify() should be immediately zero. It is zero though if we add
another simplify():
sage: (s - s.simplify()).simplify()
0
So it seems that the latex name of the function is lost somewhere in the
interface between Sage and Maxima, the latter being invoked by the method
simplify() (the code of simplify() is merely "return
self._parent(self._maxima_())").
This bug is pretty annoying because it makes completely useless the latex
display in a Jupyter notebook.
What is strange is that the above example seems to be really minimal. In
particular, if we remove the declaration of the symbolic variable b, which
is not used at all (!), everything is OK. Same thing if we remove the
argument domain='real'.
Is this a known bug? Shall I open a ticket?
Eric.
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