Philosophy 100, Fall 2006					

Time Travel handout



The first argument that time travel into the past is impossible:


	1.	If time travel into the past is possible, then it is possible
		for someone to first be at one time, and later be at an 
		earlier time.
		
	2.	It is not possible for someone to first be at one time, and
		later be at an earlier time.
		
	3.	Therefore, time travel into the past is impossible.
	
	
	
The grandfather paradox:


	1. 	If time travel is possible, then it is possible for someone
		to travel back in time and kill his grandfather.
		
	2.	It is not possible for someone to travel back in time and
		kill his grandfather.
		
	3.	Therefore, time travel is not possible.