[fruser1]

lim_x→a f(x) = L iff ∀ ε > 0 ∃ δ > 0 s.t. 0 < |x - a| < δ ⇒ |f(x) - L| < ε

[stremba]

This is what I was referring to in my post. Most people, especially high school kids, just space out when confronted with a blob of mathematical symbols such as this.