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time travel

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time travel

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  1. time travel the grandfather paradox ii

  2. Tim can kill Grandfather. • Tim cannot kill Grandfather. lewis’s puzzle

  3. Hud works with those people. • Hud doesn’t work with those people. lewis’s puzzle

  4. Hud works with Dan and Frances. • Hud doesn’t work with Ben and Zoe. lewis’s puzzle

  5. Tim can kill Grandfather. • Tim cannot kill Grandfather. lewis’s puzzle

  6. Tim’s killing Grandfather is compossible with the R facts. • Tim’s killing Grandfather is not compossible with the R+ facts. lewis’s puzzle

  7. A’s X-ing is compossible with facts F1-Fniff there is some possible world in which F1-Fn obtain and A Xs. lewis’s puzzle

  8. If time travel is possible, then one can change the past. • One cannot change the past. • [So] Time travel is not possible. the altered past paradox

  9. It is either true that Hud will eat dinner tonight or true that Hud won’t eat dinner tonight. • If it is true that Hud will eat dinner tonight, then his eating dinner is unavoidable. • If it is true that Hud won’t eat dinner tonight, then his not eating dinner is unavoidable. • [So] Whatever happens—dinner or no dinner—is unavoidable. the fatalist argument

  10. If time travel is possible, then one can commit retro-suicide. • One cannot commit retro-suicide. • [So] Time travel is not possible. the retro-suicide paradox