7. Suppose that f: R → R is continuous at c and that f(c) <0. Prove that there exists some d > 0 such that f(x) < 0 in t
Posted: Mon Jul 11, 2022 12:03 pm
7. Suppose that f: R → R is continuous at c and that f(c) <0. Prove that there exists some d > 0 such that f(x) < 0 in the d-neighborhood of c.