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Old 12-19-2008   #572 (permalink)
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Re: What is time?

Quote:
Originally Posted by modest View Post
Would everyone agree that:
  1. The past cannot be changed.
  2. Anything that is spatially separated from us (at any point in time) we cannot currently (at that point in time) experience. In other words, the only things we currently (at one point or slice of time) experience are the things touching us.
On first glance, it would appear that #1 must be an axiom of logic, that is, that time has an arrow of movement always to the future, hence it not possible to change any event in the past.

But, on the other hand, the words appear to get in the way of the logic, since I can think of many examples where the "past" clearly has been "changed". A few examples will do to show the problem. In golf there is the mulligan, the past drive into the swamp is changed to the present drive into the fairway, and your stroke score remains 1in both past and present but the past position of the ball has been changed. In American football is the instant replay--where the past decision of the call on the field is changed based on new evidence from the camera.

So, is it possible to restate #1 in such a way that the common sense logic of the axiom is maintained yet the exceptions I raise removed ? For, as it is now stated, I do not see how I can agree that statement #1 is always true for all uses of the words 'past' and 'change'.
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