It's essentially the theory that you can't have one without the other. The time machine wouldn't exist without her death and strangely her death wouldn't exist without the time machine. No matter what, her death is imminent.
This assumes time is linear and destructive within its own timeline. If you think about it, this is quite unreasonable. If he enters a timeline and steps out into the street and causes even a small change, like his footprint appears where it never should have been within that timeline, then theoretically this would cause anything from a minor time quake in the future (like a species of insect disappears) to total catastrophic destruction of the timeline. This is the paradox you speak of which occurs just as you say, where to stop a major paradox the timeline tried to correct anything that will change the future and prevent time quakes.
More contemporary theory postulates many timelines created as a result of, in this case, his entering a past moment which causes a fork in the timeline to form another possible outcome from the point of entry. This new timeline can exist totally independently of the original timeline. So an infinite number of forks and new timelines from them can exist, each one with their own events from a point of entry. This supports the multi-string theory. In one of these timelines he will build the time machine, save Emma and get a Nobel Prize.
Hey this is only a film, they are using the various theories to create their own universe for the sake of the plot ... so its ok like it is.
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I don't know what it is, but its weird and pissed off!
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