Dr. Who and the Philosophers or Time-Travel For Beginners
Harrison (Jonathan)
Source: Aristotelian Society, 1971; Supplement 45: 1-24
Paper - Abstract

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Philosophers Index Abstract

The author discusses, and tries to overcome, a number of difficulties in the logical possibility of time-travelling. These are

  1. that it would involve altering the truth value of a proposition about the past,
  2. that the journey must end before it begins,
  3. that the time-travellers must remember doing things before they have done them,
  4. that events must be caused by things which have not yet happened,
  5. that a time-traveller must sometimes be numerically identical with a man who has not yet been born, and
  6. the time-travellers must build in one place a machine which already exists at a different place.

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