1.1 --- a/NEWS Mon Nov 12 20:23:24 2001 +0100
1.2 +++ b/NEWS Mon Nov 12 23:25:25 2001 +0100
1.3 @@ -62,6 +62,23 @@
1.4 statements; NB: major inductive premises need to be put first, all the
1.5 rest of the goal is passed through the induction;
1.6
1.7 +- 'induct' proper support for mutual induction involving non-atomic
1.8 +rule statements (uses the new concept of simultaneous goals, see
1.9 +below);
1.10 +
1.11 +* Pure: support multiple simultaneous goal statements, for example
1.12 +"have a: A and b: B" (same for 'theorem' etc.); being a pure
1.13 +meta-level mechanism, this acts as if several individual goals had
1.14 +been stated separately; in particular common proof methods need to be
1.15 +repeated in order to cover all claims; note that a single elimination
1.16 +step is *not* sufficient to establish the two conjunctions, so this
1.17 +fails:
1.18 +
1.19 + assume "A & B" then have A and B .. (*".." fails*)
1.20 +
1.21 +better use "obtain" in situations as above; alternative refer to
1.22 +multi-step methods like 'auto', 'simp_all', 'blast+' etc.;
1.23 +
1.24 * Pure: proper integration with ``locales''; unlike the original
1.25 version by Florian Kammueller, Isar locales package high-level proof
1.26 contexts rather than raw logical ones (e.g. we admit to include