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{{Math-m}}
{{Math-m}}
The '''real numbers''' are a set of numbers with extremely important theoretical and practical properties. They can be considered to be the numbers used for ordinary measurement of physical things like length, area, weight, charge, etc. Mathematicians denote the set of real numbers with an ornate capital letter: <math>\mathbb{R}</math>. They are the 4<sup>th</sup> item in this hierarchy of types of [[number]]s:
The '''real numbers''' are a set of numbers with extremely important theoretical and practical properties. They can be considered to be the numbers used for ordinary measurement of physical things like length, area, weight, charge, etc. Mathematicians denote the set of real numbers with an ornate capital letter: <math>\mathbb{R}</math>. They are the 4th item in this hierarchy of types of [[number]]s:
*The "[[natural number]]s", 1, 2, 3, ... (There is controversy about whether zero should be included. It doesn't matter.)
*The "[[natural number]]s", 1, 2, 3, ... (There is controversy about whether zero should be included. It doesn't matter.)