Sympy's subs function does not seem to be able to recognize negative
multi-term expressions...
x,y = symbols('x,y')
e1_, e2_ = symbols('e1, e2')
e1 = x
e2 = 1+x
[(e1).subs(e1,e1_), (-e1).subs(e1,e1_), (e2).subs(e2,e2_),
(-e2).subs(e2,e2_)]
produces:
[e₁, -e₁, e₂, -x - 1]
Is there a reason why this can't or shouldn't be done?
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