Important sets in mathematics are commonly denoted using doublestruck characters, e.g., C for the set of complex numbers, Q for the rational numbers, R for the real numbers, for Euclidean n-space, and Z for the integers.
One way of producing blackboard bold is to double-strike a character with a small offset on a typewriter. Thus, they are also referred to as double struck. In typography, such a font with characters that are not solid is called an "inline", "shaded", or "tooled" font.
The notation Z for the set of integers comes from the German word Zahlen, which means "numbers". Integers strictly larger than zero are positive integers and integers strictly less than zero are negative integers.
R = real numbers, Z = integers, N=natural numbers, Q = rational numbers, P = irrational numbers.
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Special sets Z denotes the set of integers; i.e. {…,−2,−1,0,1,2,…}. Q denotes the set of rational numbers (the set of all possible fractions, including the integers). R denotes the set of real numbers.
also called whole numbers or counting numbers, and their additive inverses (the negative integers, i.e., −1, −2, −3, ...). The set of integers is often denoted by the boldface (Z) or blackboard bold. letter "Z"—standing originally for the German word Zahlen ("numbers").
letter (Z)The letter (Z) is the symbol used to represent integers. An integer can be 0, a positive number to infinity, or a negative number to negative infinity.
Z is the set of integers, ie. positive, negative or zero. Z∗ (Z asterisk) is the set of integers except 0 (zero). The set Z is included in sets D, Q, R and C.
In math, the letters R, Q, N, and Z refer, respectively, to real numbers, rational numbers, natural numbers, and integers.
Answer. An integer, also called a "round number" or “whole number,” is any positive or negative number that does not include decimal parts or fractions. For example, 3, -10, and 1,025 are all integers, but 2.76 (decimal), 1.5 (decimal), and 3 ½ (fraction) are not.