Chapter 14 introduces relevance logics, universes of possible worlds, infinite ordinal numbers, and parliamentary debating. And check out Deduce, the logic mystery game (on the web).

Formal topics:

• Relevance logic
• Possible worlds
• Ordinal numbers

Informal topics:

• Debate, parliamentary style

Supplementary topics:

• Lost Secrets
• Impossibility
• Buddhist logic
• Puzzles