This is a known bug. http://trac.sagemath.org/sage_trac/ticket/9314

On Jun 26, 2010, at 10:29 AM, Mike Witt wrote:

More info:

----------------------------------------------------------------------
| Sage Version 4.3.1, Release Date: 2010-01-20                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: n=var('n')
sage: f = -n/(n-1) + 1
sage: f
-n/(n - 1) + 1
sage: latex(f)
-\frac{n}{{\left(n - 1\right)}} + 1
sage: quit

----------------------------------------------------------------------
| Sage Version 4.3.5, Release Date: 2010-03-28                       |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: n=var('n')
sage: f = -n/(n-1) + 1
sage: f
-n/(n - 1) + 1
sage: latex(f)
\frac{-n}{{\left(n - 1\right)}} + 1

-Mike

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