36:07

Truthmaker Semantics

30:38

Wittgenstein's Private Language Argument

8:45

What are Possible Worlds?

13:49

Modal Concepts and Possible Worlds

26:36

Axioms in logic

32:44

The biggest new ideas in philosophy

21:19

Wittgenstein and the Rule Following Paradox

15:13

Possible Worlds and Modal Realism (explained and debated)