[isabelle-dev] NEWS

[Florian Haftmann]

This refers to Isabelle/e7c9a14632d0 and AFP/797f66d26443.

* Abolished neg_numeral.
  * Canonical representation for minus one is "- 1".
  * Canonical representation for other negative numbers is
    "- (numeral _)".
  * When devising rule sets for number calculation, consider the
    following cases: 0, 1, numeral _, - 1, - numeral _.
  * Syntax for negative numerals is mere input syntax.
INCOMPATBILITY.

This is definitely a non-trivial change with has been conceived only
after some – partly experimental – iterations.  Experts and stakeholders
in the numeral area are strongly encouraged to comment.

	Florian

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