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.
Definition of theory for English Language Learners. : 1  an idea or set of ideas that is intended to explain facts or events. : 2  an idea that is suggested or presented as possibly true but that is not known or proven to be true. : 3  the general principles or ideas that relate to a particular subject.