Modal logic
https://www.youtube.com/watch?v=ZPfw422Wcso
I had suggested, that epistemic modal logic may be of interest.
https://www.youtube.com/watch?v=FacUHU_gjPw
Relevant examples ...
https://www.youtube.com/watch?v=AtBWy4kBjfQ&list=PLz0n_SjOttTcX8T8QLHZ1n7DgtC9O5wBf&index=3
This matches many people's ideas here.
https://www.youtube.com/watch?v=IyUNo4JBsPw
I admire William James. He was a psychologist. Clifford was a mathematician.
A summary of the various standard modal logics ... pay attention to the axioms that apply to Epistemic Modal Logic
https://www.youtube.com/watch?v=sQ-M4zJ7574&list=PLz0n_SjOttTcX8T8QLHZ1n7DgtC9O5wBf