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I expect that this might be rarely taught (as I have not found much on the web).

But maybe some of you have encountered this. I attach the problem

At the end the author says to take the limit as t goes to 1. But to me, it does not make sense to look at something that is ε<x<=ε (I mean this is false) and from that to deduce that all the characteristics pass through (x,t)=(1,1)

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# Method of Characteristics/Fan of characteristics

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