The Grandfather Paradox by yurtgc548

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									    Time-Travel

T H E A LT E R E D PA S T PA R A D O X
Back to the Future
                   Back to the Future

 In BttF I, Marty travels back to 1955 and helps unite his
  parents.
 In BttF III, Marty travels back to 1855 and rescues Doc
  Brown.
 Marty helps unite his parents (in BttF I) before he
  rescues Doc Brown (in BttF III).
 Marty rescues Doc Brown (in 1855) before he helps
  unites his parents (in 1955).
                  Back to the Future

 External time is the series of events as ordered by an
  objective historian.
 Personal time is the series of events as experienced by a
  particular person.
 A time-traveler is someone whose personal time
  diverges from real time.
               The Grandfather Paradox

1) If time travel were possible, it would be possible to kill
   your grandfather before your father is conceived.
2) It’s not possible to kill your grandfather before your
   father is conceived.
3) [So] Time travel isn’t possible.
               The Altered Past Paradox

1) If time travel were possible, it would be possible to
   change the past.
2) It’s not possible to change the past.
3) [So] Time travel isn’t possible.

								
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