Why Time Travel is not Paradoxical according to David Lewis Essay Example for Free

Why Time Travel is not Paradoxical according to David Lewis EssayThe grandfather conundrum is genius of the most well known fonts of a paradox associated with meter travel. Supposing that a person, say Henry, wants to slay his grandfather, and Henry wants to travel back in measure to do so. If Henry does succeed in cleaning his grandfather at a time when the grandfather has not yet fathered the offspring that would eventually hold up Henrys p arent, then Henry would never have been born in the first place, so how could he have traveled back in time?David Lewis argues that time travel is not paradoxical. His react to the grandfather paradox is that, in the first place, Henry would not have been able to kill the grandfather. In other words, a time traveler who goes back to the past cannot change the past. According to Lewis, Henryor any time travelerwould simply be percent of the reality of the past.Henry would be part of the past as a time travelerin other words, there is only one past in the first place, and that past has always included the time traveler Henry. Thus, there are no changes that can be done to the past, because the fact that he time-traveled would have been true even originally he decided to do it, and even before he existed. Every point in time is equally real, and nothing can change it.Another paradox is the causal loop, to which Lewis solution applies as well. An example of a causal loop is when a person receives the plans for a time machine from a thick stranger. This person creates the time machine, travels back in time, and gives his younger self the plans. The problem here is the origin of the time machine plans. Where did they come from? According to Lewis, the plans would simply have had no cause, in the same way that the universe, or God, exists uncaused.