How do we know that the past is fixed and that there only exists one version of history?

Are there any interesting arguments surrounding this?

  • We do not, and one version is used for simplicity (Occam's razor). Unless one believes in determinism, in which case there is also a single future. The laws of physics are time symmetric, and quantum mechanics is just as consistent with multiple futures as it is with multiple pasts, see Wikipedia's Multiple Histories. – Conifold Dec 4 '18 at 22:31
  • Of course there's only one version of history: the whole complicated, complex truth. I like to call it reality. If we were omniscient we would know all of it. But (perhaps fortunately) we can do no better than to settle for attempting to understand the most important, critical parts of it, and the aspects of which we have some first or second-hand knowledge. – Bread Dec 4 '18 at 22:54

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