David Lewis

The four dimensions in the 16-axis model where this thinker scores highest. People in this archetype tend to lean the same way.

• TRTrust in Reason

  9 / 10
• TDTheoretical Drive

  9 / 10
• TETrust in Experience

  7 / 10
• SRSkeptical Reflex

  7 / 10

The six thinkers whose 16-dimensional positions sit closest to this one. Useful as next-reading suggestions.

• Kit FineCARTOGRAPHER

  Essence, dependence, and the ontology of fragments.

• Bernard BolzanoCARTOGRAPHER

  Theory of science — propositions in themselves before the linguistic turn.

• Michael DummettCARTOGRAPHER

  Anti-realism; meaning as use, with constructive logic in tow.

• Alonzo ChurchCARTOGRAPHER

  Lambda calculus; the undecidability of first-order logic.

• Ruth Barcan MarcusCARTOGRAPHER

  Modal logic — possible worlds before Kripke gave them his name.

• Jaakko HintikkaCARTOGRAPHER

  Game-theoretical semantics; epistemic logic for knowledge and belief.

Short exercises in the same tradition as David Lewis's thought. Each takes 5–25 minutes.

• Argument mapping →

  Draw the structure of an argument as boxes and arrows. See its load-bearing walls.

• Reductio ad absurdum →

  Take a claim seriously, run it to its logical limit, see if you still believe it.

• Counterexample drill →

  Try to break a moral rule with a single concrete case.