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A scientist creates a time machine, and goes back in time. He then proceeds to commit suicide.

Thoughts?

Anyone have any other paradoxes?

I don't think it would be a problem unless he tried to kill his younger self.

I suspect that the whole you-can't-exist-twice-in-the-same-time is an invention of novelists. Why not?

Betsy wrote: "I don't think it would be a problem unless he tried to kill his younger self.

I suspect that the whole you-can't-exist-twice-in-the-same-time is an invention of novelists. Why not?"

I agree, Betsy. :)
Besides, if he already exists, I don't think it would be a problem in either case. IMO, the right question is if you can exist twice-the-same-in-the-same-place.