IPM Calendar 
Monday 17 June 2019   Today  
Events for day: Thursday 20 June 2019    
           14:00 - 16:00     Mathtematical Logic Weekly Seminar
Talking About the Sentences that Talk About Themselves!


Talking about oneself is natural in natural languages. But it can be ambiguous or can cause difficulties in formal languages. For example, the following sentence Ax Ey (x=2y ˅ x=2y+1) says that every number is either odd or even. But how can a sentence talk about itself? Gdel had the opinion that if the biconditional φ ↔ Ψ(#φ) holds, where #φ is the Godel code of φ, then φ says about itself that it has the Ψ property. In this talk, we will discuss on this interpretation and will give some mathematical arguments for some philosophical discussions on the truth or falsity of Gdelean sen ...