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A real number is any number. Real numbers can be whole numbers or numbers which include a decimal point.
5 6356 5463 34 6 That is just not true. Real numbers do not include complex numbers, that is, those that include the square root of -1, for example.
A real number is just an ordinary number. The set of real numbers include all numbers between negative and positive infinity. Real numbers are ordered, and thus do not include imaginary numbers. A subset of real numbers refers to a group, or subsection, of real numbers. For instance, the numbers between 5 and 22 are a subset of real numbers. Another example of a subset is all even numbers, or all odd numbers.
Yes, imaginary numbers are a subset of complex numbers.
Complex numbers include real numbers, pure imaginary numbers, and the combination of those two.