*gets excited* *reads phrase in parentheticals* *sheepishly slumps off*
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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Thanks. Twitter will use this to make your timeline better. UndoUndo
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Which book?
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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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Can you fit the master argument in a tweet? If so, mind laying it out for us?
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There is an incompatibility between 3 propositions: everything that is past and true is necessary, the impossible does not follow from the possible, what neither is nor will be is possible. Diodorus argued from first 2 (apparently accepted in his day) to the negation of the last.
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