1. Laws of Nature Tooley’s Objection

2. The Underdetermination Objection Tooley’s example L1: Every 1-10 interaction results in a bond. L2: Every 1-10 interaction results in an explosion. The Regularity Theory: For all P, P is a law of nature iff P is a contingently true generalization.

3. The Underdetermination Objection Tooley’s example L1: Every 1-10 interaction results in a bond. L2: Every 1-10 interaction results in an explosion. The Ramsey-Lewis Theory: For all P, P is a law of nature iff P is a contingently true generalization that belongs to the best deductive system (as an axiom or theorem).

4. Tooley’s Argument 1) If the Ramsey-Lewis theory is correct, there is no law governing 1-10 interactions in Tooley’s World. 2) There is some law governing 1-10 interactions in Tooley’s World. 3) [So] The Ramsey-Lewis theory is incorrect.

5. Review Two worlds are A-duplicates iff they have all the same A-properties. A-properties globally supervene on B- properties iff any possible worlds that are B- duplicates are also A-duplicates. Do the laws of nature supervene (globally) on the properties and arrangements of the fundamental particles?

6. Review

10. Laws and Supervenience The Regularity Theory: For all P, P is a law of nature iff P is a contingently true generalization. Any worlds that are duplicates with respect to the properties and arrangements of the fundamental particles are also duplicates with respect to laws of nature.

11. Laws and Supervenience The Ramsey-Lewis Theory: For all P, P is a law of nature iff P is a contingently true generalization that belongs to the best deductive system (as an axiom or theorem). Any worlds that are duplicates with respect to the properties and arrangements of the fundamental particles are also duplicates with respect to laws of nature.

12. The Underdetermination Objection Tooley’s example L1: Every 1-10 interaction results in a bond. L2: Every 1-10 interaction results in an explosion.

13. Tooley’s Argument: Supervenience Version 1) If the Ramsey-Lewis theory is correct, laws of nature supervene on the properties and arrangement of the fundamental particles. 2) Laws of nature do not supervene on the properties and arrangement of the fundamental particles (since you could have two Tooley worlds, where one has L1 as a law and the other has L2). 3) [So] The Ramsey-Lewis theory is incorrect.