While reading the Wikipedia page on Fourier-transform spectroscopy, in the section "Extracting the spectrum", I found the following
$$ I(p) = \bigg(p, \int_0^\infty I(p, v) \, {\rm d} v\bigg) = \bigg(p, \int_0^\infty I(v)(1+\cos(2 \pi v p) \, {\rm d} v \bigg)$$
where
$I(p)$ is the total intensity at the detector
$v$ is the wave number
$I(v)$ is the spectrum to be determined
$p$ the path length difference
Could someone please explain to me what the comma after the $p$ here means?
Summing up the comments: The $p$:s and commas before the integral signs stem from an unexplained Wikipedia edit from 2012. They appear to have no meaning, and have now been removed from the Wikipedia article.