[isabelle-dev] NEWS

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Thu Nov 21 11:17:43 CET 2013

> Thank you for this, Florian. The one thing I had hoped for when I initiated
> this change was that one can write "n-1" just like "n+1", but that doesn't
> quite work yet, probably because you have some special syntax for what used to
> be negative numerals. This may ease the conversion, but can we get rid of it
> eventually?

The syntax for negative numerals has a bare technical reason: the
numerals of ZF.  Getting rid of negative numerals entirely would require
to switch the ZF numerals to the same representation of HOL.



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