ED Griffiths "World Line" Problem: Solution to p.506, prob. 12.22

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The discussion centers on problem 12.22 from ED Griffiths' book, which explores the concept of world lines in the context of special relativity. The solution manual asserts that it is possible for an individual to arrive at point B before departing from point A if traveling at a velocity exceeding the speed of light (c). This paradoxical scenario is illustrated through a world line diagram, demonstrating the implications of superluminal travel on causality and temporal sequences.

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In the book of ED of Griffiths, p.506, prob. 12.22, I don't understand why the solution manual says that one can say she arrived at B before she left A?
Any help would be appreciated.
 
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rbwang1225 said:
In the book of ED of Griffiths, p.506, prob. 12.22, I don't understand why the solution manual says that one can say she arrived at B before she left A?
Any help would be appreciated.

The question asks:

Show, using a world line diagram, if it's possible for her to arrive before she set out if she can travel at a velocity greater than c.
 

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