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Line 1: − + − − They are called "real" because they actually exist in the real world, i.e. measures, weights, temperatures and so on are all real numbers, as opposed to the [[imaginary number]]s, which are just an abstract concept, but do not really exist.
rm common misunderstanding about "real" and "imaginary" terminology
'''Real numbers''' can be thought of as numbers which can be represented by some infinite or finite decimal representation, such as 0.707106781187...
'''Real numbers''' are numbers that can be represented by some infinite or finite decimal representation, such as 0.707106781187...
In classical physics, measurements of things that can vary smoothly and continuously, like [[speed]] or [[temperature]], are treated as real numbers.
In classical physics, measurements of things that can vary smoothly and continuously, like [[speed]] or [[temperature]], are treated as real numbers.