.{..., -3, -2, -1, 0, 1, 2, 3, ...}
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The set of positive integers, of course!
Set of integers is denoted by Z, because it represents the German word Zahlen which means integers
Traditionally, the set of integers that represents the natural numbers is {1,2,3,...}, which are the positive integers. Some people include the non-negative integers as the set of natural numbers, which is {0,1,2,3,...}, and includes 0.
The set of integers consists of zero, the natural numbers and their additive inverses. This is often denoted by a boldface Z ("Z") standing for the German word Zahlen, "numbers".
The set of integers is the same as the set of whole numbers.