[isabelle-dev] theorem "induct"

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Tue Nov 30 08:47:36 CET 2010

Hi Sascha,

> There exists a theorem called "induct" in HOL, which changes after
> every datatype declaration.  What is the rationale behind this
> theorem?  Is it required for a particular purpose or just a forgotten
> remainder of previous tunings?  Shouldn't this suprising behaviour be
> eliminated?  Note that each datatype declaration "foo" also introduces
> a theorem "foo.induct" which looks identical to (the most recent)
> "induct".

indeed, both theorems are the same, just with different accesses;
recently, we introduced the concept of mandatory qualifiers to avoid the
strange base accesses (e.g. »induct«, »simps«, »intros«), but this has
never been systematically introduces into existing packages.




PGP available:

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 262 bytes
Desc: OpenPGP digital signature
URL: <https://mailman46.in.tum.de/pipermail/isabelle-dev/attachments/20101130/a36540d3/attachment.sig>

More information about the isabelle-dev mailing list