[isabelle-dev] (Not) Using foundational theorems in proofs

[Florian Haftmann]

Hi Brian,

I am not totally happy with changes like:

http://isabelle.in.tum.de/reports/Isabelle/rev/4657b4c11138#l1.7

The proof text itself is shorter than before, but in less trivial
examples it produces head ache to instantiate foundational theorems of
locale with OF.  Indeed, huge parts of Finite_Set.thy once were written
in that style.  The disadvantage there was that when you had to
instantiate over a hierarchy of locales, you would find yourselves
writing ... OF [... OF [...]] cascades.  From this I have drawn the
conclusion that it is better to leave module system (locale +
interpretation) and propositional system (_ ==> _ + _ [OF ...]) on their
own, even if both are embedded into the same calculus.

That particular situation is simple enough not to ask for a revert of
the changesets, though.

Cheers,
	Florian

-- 

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