Well, but if you need to define the gradient, curl and divergence and every term in the equations, the typical representation would be more than 20 lines. So I think that it's a fair comparison.

You can't really get away with just knowing del from vector calculus, as this is the geometric-calculus del. ∇F = ∇ . F + ∇ /\ F

But for defining the terms you're going to need a couple paragraphs to go along with the one equation.