How do I stop Mathematica changing the format of fractions in Input cells?

*To*: mathgroup at smc.vnet.net*Subject*: [mg125751] How do I stop Mathematica changing the format of fractions in Input cells?*From*: John Browne <john.browne at alumni.unimelb.edu.au>*Date*: Sat, 31 Mar 2012 03:44:21 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com

I am writing a notebook where I want to display some expressions in Input cells, in the 2-D fractional numerator-over-denominator format. However, I find that when I open the notebook again some time later, Mathematica has of its own accord decided to rewrite some of the fractions in the 1-D format using a "/". I have not been able to pin down precisely under what circumstances this happens, but it might be happening when the numerator and/or denominator gets over a certain length (or perhaps complexity). My trials have failed to find a reliable pattern of behaviour. The Input cells are not entered to create Output. They are just used for typesetting. Expressions copied from these Input cells into other Cell styles also show the same problem. Is there some option I can set for the affected cells (or the whole notebook) to tell Mathematica to leave them formatted just as I compose them? John