Question

What is the meaning of ¯A in a set?

Answer 1

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We use to denote the universal set, which is all of the items which can appear in any set. ... We use ' (the apostrophe) to denote the complement of a set. A' is all the items which are not in set A. A B means that set A is a subset of set B. This means that every member of set A also appears in set B.

A set in mathematics is a collection of well defined and distinct objects, considered as an object in its own right. Sets are one of the most fundamental concepts in mathematics. ... A is the set whose members are the first four positive integers.

Answer 2

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We use to denote the universal set, which is all of the items which can appear in any set. ... We use ' (the apostrophe) to denote the complement of a set. A' is all the items which are not in set A. A B means that set A is a subset of set B. This means that every member of set A also appears in set B.

A set in mathematics is a collection of well defined and distinct objects, considered as an object in its own right. Sets are one of the most fundamental concepts in mathematics. ... A is the set whose members are the first four positive integers.