Grandfather Paradox

The grandfather paradox is a proposed paradox of time travel first described by the science fiction writer René Barjavel in his 1943 book Le Voyageur Imprudent (Future Times Three). The paradox is described as follows: the time traveller went back in time to the time when his grandfather had not married yet and killed him. As a result, the time traveller was never born when he was meant to be. If he was never born, then he is unable to travel through time and kill his grandfather, which means the traveller would be born after all, and so on.Despite the name, the grandfather paradox does not exclusively regard the impossibility of one's own birth.
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