The set of real numbers is represented by a fancy script "R". However, real numbers are just represented by a number (be it integer, rational, irrational, or otherwise). The key here is that it is not a complex number (number containing the imaginary number "i").
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These number can also be represented on real line.
Any real number can be represented as a decimal number.
no, it is an imaginary number represented by an i. For example, the square root of -4 is 2i.
The real numbers are often represented by the Number Line, a straight line extending (forever) in both, the positive and negative, directions.
Things whose values do not change.