Advanced Topics

You should only begin these after completing the entire Core sequence (sections I–V). Each track goes deeper in one direction (Choose according to your goals):

Philosophical Logic

Subject Book Online Course
Philosophical Logic Philosophical Logic (Burgess, Archive.org)
Logic & Language Logic, Language, and Meaning (Gamut)
Epistemic Logic Reasoning About Knowledge (Fagin et al.)
Deontic Logic Handbook of Deontic Logic (Open PDF)

Logic for Computer Science & AI

Subject Book Online Course
Automata & Formal Languages Introduction to Automata Theory (Hopcroft et al.) Automata (MIT OCW Automata, related)
Logic Programming Foundations of Logic Programming (Lloyd)
Temporal Logic Temporal Logic (Emerson)
Automated Theorem Proving Handbook of Automated Reasoning (Vol. I, open sections)

Mathematical Logic (Advanced)

Subject Book Online Course
Model Theory Marker – Model Theory (Free PDF)
Axiomatic Set Theory Jech – Set Theory
Large Cardinals Kanamori – The Higher Infinite
Reverse Mathematics Simpson – Subsystems of Second-Order Arithmetic

Limits and Extensions of Classical Logic

Subject Book Online Course
Gödel’s Incompleteness Theorems Gödel’s Proof (Nagel & Newman, Archive.org) Theory of Computation (MIT OCW)
Modal Logic An Introduction to Non-Classical Logic (Priest) Modal Logic (MIT OCW)
Non-Classical Logics (Survey) Priest Modal Logic (MIT OCW Modal Logic)