A differential [math]1[/math]-form in one dimension is [math]\omega = f(x)\,dx[/math], where [math]f:\R\to\R[/math] is some function.
A differential is exact if it's the derivative [math]d[/math] of some other differential. A [math]1[/math]-form is exact if it's [math]d[/math] of some [math]0[/math]-form.
A [math]0[/math]...
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