How to "Integrate Along A Characteristic Curve"

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In The book "Handbook of Nuclear Engineering" by Dan Cauci, the following passage is shown on page 458.

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What does he mean "integrate along the curve?" As in a line integral? What do I do with the dy and dx?

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It is a parametrisation: $x(s)$ is the $x$-position given $s$ and vice versa. It is fairly common to do this. See for instance http://tutorial.math.lamar.edu/Classes/CalcIII/LineIntegralsPtI.aspx