It would be great if we could finalise the proposal for the uniqueness quantifier.
I was planning to do this in a strictly upward compatible way, so with no implications for the existing quantifier notations and no changes to existing theorems, but a few new theorems. For that I think that "∃⇩≤⇩1” is a standard notation and works well enough. The notation “∃!” for unique existence is also absolutely standard and surely does not need to change. Larry > On 2 May 2020, at 18:17, Makarius <[email protected]> wrote: > > In contrast, the other idea "∃⇩≤⇩1" from Mathoverflow would come out for Ex1 > as "∃⇩=⇩1" or "∃⇩1", and thus introduce an incoherence of notation. > _______________________________________________ isabelle-dev mailing list [email protected] https://mailman46.in.tum.de/mailman/listinfo/isabelle-dev
