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## Converting $\ln|x| = h$ to $x = e^h$

In Kreyszig’s Advanced Engineering Mathematics, section on First-Order ODEs, it is written: $dF/F = p \, dx$ $\ln|F| = h = \int p \, dx$ Therefore, $F = e^h$ However I don’t understand why the absolute value for $F$ is gone. To my understanding, a simplified version of this could […]