# Section 1.5: Problem 12 Solution

Working problems is a crucial part of learning mathematics. No one can learn... merely by poring over the definitions, theorems, and examples that are worked out in the text. One must work part of it out for oneself. To provide that opportunity is the purpose of the exercises.

James R. Munkres

Is the set
complete? Support your answer.

Actually, we already answered this question in Exercise 7(b), where we showed that the subset
of
is not complete. See the last two paragraphs of that solution.