Continuous Functions
Practice Problem Answers
Practice 1: (Fig. 23) is continuous everywhere except at where this function is not defined.
If , then so is continuous at . If , then so is continuous at .
is not defined., and so does not exist.
Practice 2: (a) To prove that is continuous at , we need to prove that satisfies the definition of continuity at : .
Using results about limits, we know
(since is assumed to be continuous at ) so is continuous at .(b) To prove that is continuous at , we need to prove that satisfies the definition of continuity at :
Again using information about limits,