I wrote:
>
> Unfortunatly, mapping to QutputForm is _not_ injective, there
> is information loss:

Convertion to InputForm is supposed to be injective, but:
- smaller number of domains implements this conversion
  (compared to coercion to OutputForm)
- I think that currently implemented convertions are
  injective _within_ domain, but I would not be
  surprised to see elements of different domains giving
  you the same InputForm.

-- 
                              Waldek Hebisch
[email protected] 

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