The number line is a straight line, extending indefinitely in both directions, on which every point represents a real number and every real number is represented by a point. Formally, it is an injective map from the real numbers to a line in Euclidean space. Below is an example of part of the number line, only showing the area between 9 and -9. File:Number line.png File:Obelus symbol.svg This arithmetic-related article contains minimal information concerning its topic. You can help the Mathematics Wikia by adding to it.
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