[isabelle-dev] theorem "induct"
florian.haftmann at informatik.tu-muenchen.de
Tue Nov 30 08:47:36 CET 2010
> 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)
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.
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