Skimming old modal logic textbook. They casually show Diodorus’ master argument for fatalism is valid then move on. I mean, ok, maybe I’d like to pause on this? In any case #stoicism confirmed I guess. (Yeah yeah I know the difference between validity and soundness don’t @ me.)
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Which book?
It's just an illustrative example early on in Fitting & Mendelsohn's First-Order Modal Logic. I actually learned modal logic from this years ago, but somehow it never struck me the first time round.
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I've only reach the chapter on the Barcan and converse Barcan formulas in that book. I'll have to go see what they think of the Master Argument.
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