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time travel. the double-occupancy paradox. If the time machine were traveling into the future, we would see it right now. We don’t see it right now. [So] The time machine isn’t traveling into the future. If the time machine were traveling into the past, we would have seen it on Thursday.

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time travel

time travel

the double-occupancy paradox

the psychologist s argument

If the time machine were traveling into the future, we would see it right now.

  • We don’t see it right now.
  • [So] The time machine isn’t traveling into the future.
  • If the time machine were traveling into the past, we would have seen it on Thursday.
  • We didn’t see it on Thursday.
  • [So] The time machine isn’t traveling into the past.
  • If (3) and (6), then the time machine isn’t traveling in time.
  • [So] The time machine isn’t traveling in time.
the psychologist’s argument
the psychologist s argument1

If the time machine were traveling into the future, we would feel it right now.

  • We don’t feel it right now.
  • [So] The time machine isn’t traveling into the future.
  • If the time machine were traveling into the past, we would have felt it on Thursday.
  • We didn’t feel it on Thursday.
  • [So] The time machine isn’t traveling into the past.
  • If (3) and (6), then the time machine isn’t traveling in time.
  • [So] The time machine isn’t traveling in time.
the psychologist’s argument
the revised argument

If the time machine were traveling continuously into the future, we would see it right now.

  • We don’t see it right now.
  • [So] The time machine isn’t traveling continuously into the future.
  • If the time machine were traveling continuously into the past, we would have seen it on Thursday.
  • We didn’t see it on Thursday.
  • [So] The time machine isn’t traveling continously into the past.
  • If (3) and (6), then the time machine isn’t traveling continuously in time.
  • [So] The time machine isn’t traveling continuously in time.
The revised argument
the double occupancy paradox

If continuous travel into the past is possible, then double occupancy in possible.

  • Double occupancy isn’t possible.
  • [So] Continuous travel into the past isn’t possible.
the double-occupancy paradox