Notes to Laws of Nature

1. This follows according to Lewis's (1973) logic of counterfactuals and any logic that endorses centering (i.e., the principle that, necessarily, the conjunction of P and Q implies that, if P were the case, then Q would be the case).

2. Portions of the current update of this entry draw directly from portions of the introduction to Carroll (2004). The original 2003 entry served as a basis for that introduction.