An integer is a number that is written without a fractional component. For example, 21, 4, and −2048 are integers; 9.75, 5½, and √2 are not integers. The set of integers consists of the natural numbers (1, 2, 3, ...), zero (0) and the opposites of the natural numbers (−1, −2, −3, ..., that are negative).The name derives from the Latin integer (meaning literally "untouched," hence "whole": the word entire comes from the same origin, but via French). The set of all integers is often denoted by a boldface Z (or blackboard bold , Unicode U+2124 ℤ), which stands for Zahlen (German for numbers, pronounced [ˈtsaːlən]); it is a subset of the sets of rational and real numbers.
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