Extraneous parentheses in latex(e^-x)

[slel]

Reported by Andy Howell on sage-devel.

Current:

sage: h = e^-x
sage: latex(h)
e^{\left(-x\right)}

Wish:

sage: h = e^-x
sage: latex(h)
e^{-x}

See further analysis and links in the 2018-09 sage-devel discussion.

CC: @DaveWitteMorris @rwst @slel

Component: symbolics

Keywords: latex, symbolic expression

Issue created by migration from https://trac.sagemath.org/ticket/26337

[slel]

comment:2

Not sure whether the fix belongs in Sage or GiNaC or Pynac. Any insight anyone?

[slel]

comment:4

Likewise:

sage: a = exp(2*x)
sage: a  # good: we need those parentheses
e^(2*x)
sage: latex(a)  # should skip parentheses
e^{\left(2 \, x\right)}

and

sage: b = exp(x/2)
sage: b  # good: we need those parentheses
e^(1/2*x)
sage: latex(b)  # should skip parentheses
e^{\left(\frac{1}{2} \, x\right)}