Time travel and grandfather paradox:
Earman suggests in his 1995 paper that physical possibility should be considered similarly with the laws of nature (i.e. logical possibility). Does this mean that it when David Lewis says Tom can humanly kill his grandfather (compossibile with the facts that he is a good marksman and has good aim etc.) implicitly assumes that it is also logically possible to kill his grandfather (thereby creating the contradiction).
This sounds like the same argument Vranas makes: https://onlinelibrary.wiley.com/doi/full/10.1111/j.1468-0114.2009.01353.x#
Would a solution suggesting that Earman and Vranas have intensional context in their mode of reasoning overcome this challenge to Lewis' contextualised 'can' vs 'cannot' solution to the grandfather paradox.