Edward Feser: The metaphysical presuppositions of formal logic
For instance, “If it is necessary that water is H 2O, then this strictly implies that the fact that tomorrow is Taco Tuesday strictly implies that water is H 2O.” That weird sort of modal statement hardly captures the kind of necessary connections in nature that Aristotelians posit when they affirm the reality of causal powers. Now, David Lewis famously held that every possible world is as real as the actual world. And as Anjum and Mumford point out, this provides a way to read even statements in modal logic in a Humean manner that denies any intrinsic causal connections between thin...
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