Difference between revisions of "Real number"

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A '''real number''' is a number that falls on the real number line. It can have any value. Some examples of real numbers are:<math>1, 2, -23.25, 0, \frac{\pi}{\phi}</math>, and so on. Numbers that are not real are  <math>3i</math>, <math>3+2.5i</math>, <math>3+2i+2j+k</math>, i.e. [[complex numbers]], and [[quaternions]].
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A '''real number''' is a number that falls on the real number line. It can have any value. Some examples of real numbers are:<math>1, 2, -23.25, 0, \frac{\pi}{\phi}</math>, and so on. Numbers that are not real are  <math>\ 3i</math>, <math>\ 3+2.5i</math>, <math>\ 3+2i+2j+k</math>, i.e. [[complex numbers]], and [[quaternions]].
  
The set of real numbers is denoted by <math>\mathbb{R}</math>. Commonly used subsets of the real numbers are irrational numbers, rational numbers, integers, and natural numbers.  
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The set of real numbers is denoted by <math>\mathbb{R}</math>. Commonly used subsets of the real numbers are irrational numbers (<math>\mathbb{J}</math>), rational numbers (<math>\mathbb{Q}</math>), integers (<math>\displaystyle\mathbb{Z}</math>), and natural numbers (<math>\mathbb{N}</math>).  
  
  

Revision as of 17:31, 24 June 2006

A real number is a number that falls on the real number line. It can have any value. Some examples of real numbers are:$1, 2, -23.25, 0, \frac{\pi}{\phi}$, and so on. Numbers that are not real are $\ 3i$, $\ 3+2.5i$, $\ 3+2i+2j+k$, i.e. complex numbers, and quaternions.

The set of real numbers is denoted by $\mathbb{R}$. Commonly used subsets of the real numbers are irrational numbers ($\mathbb{J}$), rational numbers ($\mathbb{Q}$), integers ($\displaystyle\mathbb{Z}$), and natural numbers ($\mathbb{N}$).


See Also

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