[FOM] An intuitionistic query
Thomas Lord
lord at emf.net
Tue Sep 15 18:49:21 EDT 2009
On Fri, 2009-09-11 at 21:41 +0100, Thomas Forster wrote:
> > For any of these interpretations, I have a related question.
> > Is the following intuitive implication
> > A={a,b,c} ==> |A|=1 v |A|=2 v |A|=3 (**)
> > intuitionistically valid?
> >
> No, because it implies that all equations between a,b and c obey
> excluded middle.
Is there a conventional intuitionistic object "bottom"
(as in "undecidable" or "unknowable")?
I.e., the theorem:
A = {a,b,c} ==> |A|=1 v |A|=2 v |A|=3 v |A|=\bottom
would be true?
-t
More information about the FOM
mailing list