# What does the superscript "d" mean in the differential?

1. Oct 25, 2017

### ianmgull

1. The problem statement, all variables and given/known data

I as just hoping someone could help me parse the notation here. What does the superscript "d" mean in the differential of the integral?

Thanks!

2. Oct 25, 2017

### NFuller

I believe it's the dimension of the integral. For example, in three dimensions $d=3$.