Grandfather’s Murder

Abstract Is travel to the past possible or does it harbour some hidden contradiction? It seems that if time travel is possible, a man could travel back in time and kill his grandfather before his father was conceived. Yet this is impossible. This conundrum has become known as the Grandfather Paradox. Some philosophers have attempted to defuse the paradox, and yet others have argued that the standard resolution of the paradox is open to a charge of incoherence. I argue that this charge is ungrounded.