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Originally posted by Dave
Basically, are you saying that in a 'single timeline' idea, the two Marty's could not exist together in 1955? If you are then I think I understand you, but not sure if I agree.
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No, you missunderstood two Marties can exist in 1955 but the thing with Single line time is that you actualy can't change anything. For ex. The time travel you make to the past is already the past of your universe. You just haven't lived through it. But anyway this theory has a hole. expecialy when you time travel intentionaly in ordr to cheat the rules.
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Example. You put an egg on your desk and leave it there for 10 minutes. Then you travel back in time 5 minutes and smash the egg on your desk. According to this theory, that's not possible... there'd be something there to stop you. I reckon you could break the rule and smash the egg
You know what would hapen then : 5 minutes after you put the egg on your desk you would see your other self creating out of nowhere and smashing the egg.
The question is when you see yourself smashing the egg in singe line time .... what will you do ? that is will you time travel or sudenly decline to do it ...
The answer is simple you will time travel since you smashed the egg it acualy happened so it happened ... heh kinda mind blowing .... but that's single line time for ya ....
OK, so you've decided you're gonna do this experiment.. you put down the egg at 8:00... if another 'you' appears at 8:05 then you refuse to go back in time. If he does show up, you decide to go back. Weird hey...
So , on a mission to explicitly cheat the rule, you decide to go back if and only if the other guy doesn't show up. Similarly you don't go back if and only if the guy does show up.
Well thats it, this the logicall mistake of single line time. I tend to agree with the paralell time universes...