Set Standard Numbers

• N is the set of natural numbers. N = {0, 1, 2, 3, …}
• Z is the set of integers Z = {…, -2, -1, 0, 1, 2, …}
• Z+ is the set of positive integers Z+ = {1, 2, 3, …}
• Q is the set of rational numbers (fraction of integers, and whole integer values) Q = {p/q | p ∈ Z, q ∈ Z, and q ≠ 0}
• Q+ is the set of positive rational numbers (fraction of integers, and whole integer values) Q = {p/q | p ∈ Z+, q ∈ Z,+ and q ≠ 0}
• R is the set of real numbers in number line including integers, decimal, rational and irrational numbers.
• R+ is the set of positive real numbers in number line including integers, decimal, rational and irrational numbers(non-repeating decimal).