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

[Florian Haftmann]

> Should we ask a wider audience (isabelle-users) if anybody else has good reasons against/for a change?

The thought deserves attention, but I think the discussion is too early
for that.

Indeed, this is where, as I deem, we current are:
* Some agreement that mixing sets and predicate syntax in specifications
has drawbacks.
* We try where we get if we reduce this.

Whether this will ultimately result in a separte set type constructor is
still an open question.

All the best,
	Florian

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