Many people with fibromyalgia continue to work full or part time. But the chronic pain and fatigue associated with fibromyalgia often make working very difficult. If you are employed, it's important to learn about managing fibromyalgia symptoms and coping with pain and fatigue.
Definition of SET THEORY. : a branch of mathematics or of symbolic logic that deals with the nature and relations of sets.
Then our sets included integers. The universal set for that is all the integers. In fact, when doing Number Theory, this is almost always what the universal set is, as Number Theory is simply the study of integers. But in Calculus (also known as real analysis), the universal set is almost always the real numbers. And in complex analysis, you guessed it, the universal set is the complex numbers.