Peter Gärdenfors - The Geometry of Meaning

https://www.youtube.com/watch?v=L0X9mEe9aY0

Claudio Costa: THE PROPER THEORY OF PROPER NAMES

https://www.youtube.com/watch?v=J_ilS_tTtOI

Slavoj Zizek - Language and Reality

https://www.youtube.com/watch?v=r7f8hyT46fo