[FOM] "This sentence is true"

[Richard E. Grandy]

>schiphol at altern.org wrote:
>
>In a former message, I wrote:
>
>
>>Doesn't this amount to forbid all self-referential
>  >sentences?
>
>About "This sentence is true", what I can say is that asigning a truth value
>to it does not lead to any further complication. This is not true of the
>Liar. It would be nice for a solution to the Liar to save this difference.
>
>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>Just forbid liars.
>
Sometimes it is hard to tell if a sentence is a Liar:

This sentence is false iff Goldbach's conjecture is true.

Richard Grandy
Philosophy & Cognitive Sciences
Rice University
Houston,TX, USA