[isabelle-dev] Fwd: [isabelle] Tiny minor backward-compatible changes to IFOL
nipkow at in.tum.de
Mon Apr 27 12:58:18 CEST 2020
On 27/04/2020 11:23, Lawrence Paulson wrote:
> But looking more closely, the specific proposal (regardless of the implementation) is excellent: it is simply an “at most one” quantifier, which we also need in Isabelle/HOL, and I’m wondering that I didn’t grasp the need for this 30 years ago.
I don't recall feeling the need for it, although I may just be too used to what
we have to conceive of notions beyond. But I have (almost) never seen it
anywhere else. There are of course the counting quantifiers.
Having said that, I wouldn't object to an "at most one" quantifier provided it
has a decent syntax. See
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