[isabelle-dev] (Re-)introducing set as a type constructor rather than as mere abbreviation

[Florian Haftmann]

[forgot to answer in particular]

> inquit Brian:
>> As long as we put off reintroducing 'a set as a separate type, we will
>> continue to accumulate more theories (like Multivariate_Analysis) that
>> confuse sets and predicates. The job of introducing 'a set will only
>> get more difficult the longer we wait. I would certainly like to see
>> the job completed before the next release, although it might require
>> more time than we have.

I feel sympathetic with that concern, but I do not view that so
critical: according to what is currently going on in the repository, now
many contributors are aware to avoid set/pred mixture, and even so have
a personal interest to have the set type constructor back.  For the
black matter outside there, the introduction of the set type constructor
is invasive anyway.

Cheers,
	Florian

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