/sci/ - Science & Math

Question about notation.

Say that I have some finite discrete values [math]\{ p_1, \ldots, p_n \}[/math] and I want to sum up the absolute values of all the negative ones only. I can write [math]\sum_{ i : p_i < 0} \left| p_i \right|[/math] and everything is bueno.

But how the fuck do I write it if I have a continuous measure? I want the same thing, just an integral of the absolute values of the negative terms. Does it make any sense to write something like [math]\int_{\nu(x) < 0} \left| d \nu(x)\right|[/math]