wenzelm [Thu, 25 Oct 2001 02:13:02 +0200] rev 11930
* HOL/record:
- provides cases/induct rules for use with corresponding Isar methods;
- "record" operation truncates to particular fixed record (acts like
a type cast);
- make_defs no longer part of default simps;
- internal definitions directly based on a light-weight abstract
theory of product types over typedef rather than datatype;