Andy,
three weeks ago, after the partial exploration discussed on this list,
I switched to other preoccupations and forgot to get back to this.
To recap and go a little further, here is how I would describe
the issue and some steps to explore it:
Current:
sage: h = e^-x
sage: latex(h)
e^{\left(-x\right)}
Wish:
sage: h = e^-x
sage: latex(h)
e^{-x}
The function `latex` (see `latex??`) calls `self._latex_`
which itself (see `h._latex_??`) calls
self._parent._latex_element_(self)
In this case, self._parent is Sage's symbolic ring,
so the issue can be reformulated as:
Current:
sage: h = e^-x
sage: SR._latex_element_(h)
'e^{\\left(-x\\right)}'
Wish:
sage: h = e^-x
sage: SR._latex_element_(h)
'e^{-x}'
This method `SR._latex_element_` (see `SR._latex_element_??`)
is defined in sage/symbolic/ring.pyx, see:
https://github.com/sagemath/sage/blob/master/src/sage/symbolic/ring.pyx#L888
Exploring further, it calls:
char_to_str(GEx_to_str_latex(&x._gobj))
The only other place I find `GEx_to_str_latex` is in
sage/src/sage/libs/pynac/pynac.pxd
see also (searching the sagemath/sage repo on GitHub):
https://github.com/sagemath/sage/blob/master/src/sage/libs/pynac/pynac.pxd#L261
Pynac's wiki has a note about the latexing of symbolic expressions:
https://github.com/pynac/pynac/wiki/%7C-printing
Not sure where to go from there. This seems to be leaving the Python
world and to be calling some C or C++ library, where I'm less fluent.
I created a ticket for this issue. I hope this can get solved!
- Sage Trac ticket 26337
Extraneous parentheses in latex(e^-x)
https://trac.sagemath.org/ticket/26337
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