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Nebula 08-09-2012 02:57 AM

PDEs and Characteristics
I just wanted to know the exact definition of a characteristic. I know that they are lines on which the solution is constant for a homogeneous solution and behaves in a certain way for an in homogenious equation.
I have a question in an assignment wanting me to prove that the solution is constant along a characteristic. This suggests to me that my understanding of characteristics is not quite right as proof by definition seems unsatisfying.

Uhm this is an applied math course so I do not need something rigorous.

Thank you for you time.

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