1. The problem statement, all variables and given/known data I recently came across a simple type of integral that I did not know how to evaluate. Generally speaking how would one interpet [tex]\int_0^a dxf(x)[/tex]? 2. Relevant equations 3. The attempt at a solution At a glance, I thought to integrate with respect to 1, but then noticed the f(x) touching the differential. I have never seen this before.