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.)
-
Can you fit the master argument in a tweet? If so, mind laying it out for us?
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.
-
-
Thanks! The first premiss is the controversial one, right? (Looks false to me.)
-
Aye, Diodorus apparently had a well developed theory of modality to back it up (and the argument is valid under that interpretation of the modal operators) - but just scanning them without having thought about it too much it'd be the first I'd disagree with too.
End of conversation
New conversation -
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.