[isabelle-dev] theorem "induct"

[Florian Haftmann]

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.

	Florian

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