It means that he is not good at math. For him.like science, with math, he still has never proven one concept.<quoted text>
You seem good with math.
What does "5 is an abstract concept in a formal system" mean, in Redneck terms?
Most of them live in a world of assigned value. So, the number 5 is assigned a value and they do not seek the actual valuation, formula and proof to arrive at the number idependent of the assigned value.