[isabelle-dev] Order Relations

Lawrence Paulson lp15 at cam.ac.uk
Tue Feb 19 12:43:51 CET 2013

It depends upon whether you regard having a carrier set as the norm or an exception. I think there are many natural constructions on relations that can only be done in the presence of a carrier set.

On 19 Feb 2013, at 02:50, Christian Sternagel <c.sternagel at gmail.com> wrote:

> My main problem with the current definition is that it is not (just) reflexivity, but rather reflexivity plus an additional property (that ensures that a relation is only defined on a domain). Why not split these in two separate predicates and use the second one only where really necessary?
> I'm not sure how much work it would be to use this new definition of reflexivity. But if people think that what I say makes sense (or is more natural as reflexivity), I would give it a try and report afterwards.

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