MATHEMATICS I (MATEMATİK I) - (İNGİLİZCE) Dersi Sets and Numbers soru detayı:

CEVAP:

Usually the sets that we deal with are subsets of some ambient set. Such a set is called a universal set and is denoted by U. In other words, U is the universal set if all the sets under examination are subsets of U. The difference U \ A is called the complement of A and is denoted by Ac . That is,
Ac = U \ A = {x| x ? U and x ? A}