A function f(x) is continuous at a point c if, and only if, for every ε > 0 there is a δ > 0 such that whenever there is an x with |x-c| < δ, then
5. A function f(x) is continuous at a point c if, and only if, for every ε > 0 there is a δ > 0 such that whenever there is an x with |x-c| < δ, then