Examples of temporal paradox
Grandfather paradox: where a person goes back in time to kill his grandfather before he had any biological descendant. If they succeed, one of their parents would never exist and they themselves would never exist either.
the bootstrap paradox: or ontological paradox, is a paradox of time travel in which information or objects can exist without having been created. After information or an object is sent back in time, it is recovered in the present and becomes the very object or information that was initially brought back in time in the first place
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