[Iris-Club] Excluded middle leads to inconsistency

[Derek Dreyer]

Yes.  This is exactly why I put the Box there.

Where did I use True |- Box(True)?

Derek

On Wed, May 3, 2017 at 10:44 AM, Aleš Bizjak <abizjak at cs.au.dk> wrote:
> On 03 May 2017, at 10:41:30, Ralf Jung wrote:
>
>> Actually I thought "not P := P -> False", no box involved.
>
> Isn't Derek's P defined as P(x) = □(x ↦ 0 ∨ ¬(x ↦ 0)) = □(x ↦ 0) ∨ □(¬ x ↦ 0)?
>
> -- Aleš
>
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