The blackboard bold style Z, used to indicate the set of integers, derives from the German word zahlen, meaning numbers.
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It is the set of integers, denoted by Z.
Whole numbers are integers greater than or equal to zero.
-10 belongs to the set of all integers denoted by Z.
The set of integers consists of zero, the natural numbers and their inverse (negatives). This is denoted by a boldface Z standing for the German word Zahlen. It means that Z is a subset of the sets of rational and real numbers and is countably infinite.
The set of integers is represented by Z.