Section 10: Problem 5 Solution
Working problems is a crucial part of learning mathematics. No one can learn topology 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
Show the well-ordering theorem implies the choice axiom.
Given a collection of disjoint sets take their well-ordered union and for each set take its smallest element in the union.