Number Systems
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What are natural numbers?
ℕ is the set of natural numbers used for counting ℕ = {0,1,2,3,4, … }
What are Integer Numbers?
• whole numbers • ℤ is the set of integer numbers, which include the natural numbers and their negative inverses ℤ = {… -2, -1, 0, 1, 2 … }
What are Rational Numbers?
ℚ is the set of numbers that can be written as simple fractions
What are irrational numbers?
An irrational number cannot be written as a ratio of two numbers.
What are real numbers?
ℝ is the set of real numbers, which includes: whole numbers, integers, rational and irrational numbers; they can be positive, negative or zero. • R includes:1,12.41,√2, 0, 12/7, 1/8, 1.23423, 129.6
What are ordinal numbers?
Ordinal numbers are used to describe the position of an object in an ordered list.