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Originally Posted by Twistys Tim
And this has been practically proven by whom...?
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since we don't know weather we live in a 4d existance or a 10d existance none has "practically proven" it
However it has been logically proven, by enstein under his duality of time.
There are only two possible outcomes either you can change the present by altering the past, or you can't change the present by altering the past.
The ultimate paradox that describes this situation is grandfather paradox.
the solution if you can alter the past is an alternative timeline where both conditions exist at the same time (10 d spacetime).
If you can't change the present by altering the past the solution is the predestination paradox, in which your actions in the past created the present you were hoping to change (4d spacetime).
since the movie had a predestination paradox it must logically be a 4d space time contruct, which precludes alternate realities since there would be no 5th dimension to for that reality to exist.
as to the arguement of free will, it exists but only forward moving timestream where cause preceeds effect. under those conditions changes you make change the world. IT only when you switch the relationship that free will disappears.