In integers Z stands for dash
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The set of integers is often denoted by the boldface (Z) or blackboard bold {\displaystyle (\mathbb {Z} )} letter "Z"—standing originally for the German word Zahlen ("numbers").[4][5][6][7]
ℤ is a subset of the set of all rational numbers ℚ, which in turn is a subset of the real numbers ℝ. Like the natural numbers, ℤ is countably infinite.
The integers form the smallest group and the smallest ring containing the natural numbers
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