LaTeX representation of fractions still broken

[robert-marik]

Similarly as in #9314

sage: latex(-(x+1)/(x+2))
\frac{-x + 1}{x + 2}

note the minus sign :(

Also (another report from web):

sage: var('a b c x')
sage: solve(a*x^2+b*x+c==0,x)[0]
x == -1/2*(b + sqrt(-4*a*c + b^2))/a
sage: latex(_)
x = \frac{-b + \sqrt{-4 \, a c + b^{2}}}{2 \, a}

CC: @burcin

Component: symbolics

Keywords: latex, fraction, pynac

Author: Burcin Erocal

Reviewer: Karl-Dieter Crisman

Issue created by migration from https://trac.sagemath.org/ticket/9834

[robert-marik]

Description changed:

--- 
+++ 
@@ -7,4 +7,14 @@
 
 note the minus sign :(
 
+Also (another report from web):
 
+```
+sage: var('a b c x')
+sage: solve(a*x^2+b*x+c==0,x)[0]
+x == -1/2*(b + sqrt(-4*a*c + b^2))/a
+sage: latex(_)
+x = \frac{-b + \sqrt{-4 \, a c + b^{2}}}{2 \, a}
+```
+
+

[burcin]

comment:2

I fixed this while working on #9394 a while ago. I should have posted a new version of pynac before going on vacation, but couldn't find the time. Hopefully in the next days I'll push my changes to trac for review.

[burcin]

comment:3

There is a new pynac version that fixes this at #9901, corresponding doctest fixes are included in the patch at #9394.

This ticket should be closed when those are merged.

[kcrisman]

comment:4

With inclusion of #9901, positive review. Do not merge until #9901 is merged. Doctests are at #9394.

[kcrisman]

Author: Burcin Erocal

[kcrisman]

Reviewer: Karl-Dieter Crisman