this argument proves that people cant travel back in time

Thank you for giving me the opportunity to have an honest debate with you. Good Luck. _________________________________________________________________________ My rebuttals will be as follows: 1) the flaw in the breakdown of the scenario 2) the 3 most popular time-space continuum theories 3) media portrayals of a very similar scenario ('Looper') Before beginning with my rebuttals, am I right in assuming P3, P2 and P1 refer to the Persona series of video games? Just a personal question. 1) It is wrong to assume that some part of the scenario NEEDS to be logically impossible. After many years of schooling and practicing of higher level physics I have learned many things. One thing that i have come to realize is that when the answer is not perfectly clear nothing is impossible. Based on special relativity, time slows down when moving at speeds close to the speed of light. The theory also states that at the speed of light, time stops. Based on this, one could say that by going faster than the speed of light, one could reverse time in their frame of reference and thus move backwards in time. Another theory states that one would need an infinite amount of energy to move at the speed of light. At this time, neither theory has been fully proven correct or fully proven false. It is very possible that at least one of these theories is wrong. It is impossible to say something is impossible until you can prove it unequivocally. 2) Your argument also assumes a very specific time-space continuum. The theory you are using is that time is perfectly linear and any change in the past will in turn change the future. In this sense, you would be perfectly correct. Fry killing his father before he himself is born would make it impossible for him to be born and in-turn make it impossible to kill his own father, making his father survive and him being born. In this scenario then, theory also states that it is possible to create an infinite loop in which Fry is born and un-born, killing his father and not killing his father. Thus, all time after which Fry goes back in time never exists and the world ends at the exact time Fry leaves the "present". Another theory is the split-continuum theory. At the exact time in which Fry, or someone in a different scenario going back in time changes the past (i.e. killing someone, buying something, telling someone the future, etc) another universe instantaneously appears, parallel to the original in which the future takes place completely independent from the original timeline. In this theory, Fry CAN kill his father and exist at the same time. He has successfully created a new universe in which he is not born but exists. Yay paradoxes. This next theory is one of my favorites in terms of how hard it is to understand, Much like the first, this theory has only one timeline. Based on this specific scenario, when Fry goes back in time and kills his father, he does effectively prevent his own birth, but that does not create the paradox in which he never existed. The instant that Fry left the "present", he is no longer affected by the space-time continuum. When he kills his own father and prevents his future birth, he is unaffected and remains in the past as a paradoxical entity (much like ghosts, if they exist). 3) MAJOR SPOILERS!!! In this scenario, a man is sent to the past to be killed. It is clean and nearly impossible to find the body. One man kills himself from the future who was sent back in time. He lives through his whole life before he inevitably sent back in time in order to be killed by his younger self. He then fights against his younger self and survives. Based on the most accepted theory (#1 of rebuttal 2), the instant he made the decision to fight against his own death would have changed everything in his mind (whether to rebel, his wife and his life as a whole). Using media as a source (as i assume you did as well), you are wrong. ~again i wash you luck and a thank you.