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en.wikipedia.org/wiki/Real_number

In mathematics, a real number is a value that represents a quantity along a line. The adjective real in this context was introduced in the 17th century by René ...

www.mathsisfun.com/numbers/real-numbers.html

Mathematicians also play with some special numbers that that aren't Real Numbers. The Real Number Line. The Real Number Line is like a geometric line.

virtualnerd.com/pre-algebra/real-numbers-right-triangles/real-and-irrational/define-real-numbers/real-number-definition

Note: Real numbers are numbers that can be found on the number line. This includes both the rational and irrational numbers. This tutorial explains real ...

mathworld.wolfram.com/RealNumber.html

"Plouffe's Inverter" includes a huge database of 54 million real numbers which are algebraically related to fundamental mathematical constants and functions.

whatis.techtarget.com/definition/real-number

A 'real number' is any element of the set R, which is the union of the set of a rational numbers and the set of irrational numbers.

math.vanderbilt.edu/schectex/courses/thereals

It is true that the real numbers are 'points on a line,' but that's not the whole truth. This web page explains that the real number system is a Dedekind-complete ...

An old video of Sal where he simplifies square roots in order to determine whether they represent rational or irrational numbers.

www.mathopenref.com/real-number.html

A real number is a value that represents a quantity along a number line.

www.mathwords.com/r/real_numbers.htm

This includes (but is not limited to) positives and negatives, integers and rational numbers, square roots, cube roots , π (pi), etc. Real numbers are indicated by ...

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