Real numbers form a proper subset of the set of complex numbers.
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No. The set of real numbers contains an infinitely more irrational numbers than rational numbers.
The set of complex numbers is a field which contains the set of real numbers as a proper subfield.
Any set that contains it. For example, the set {1, 2.3, 2.236067977} or {-79000, pi, 2.236067977, sin(47)} or all real numbers, etc
To any set that contains it! It belongs to {sqrt(5)}, or {45, sqrt(2), pi, -3/7, sqrt(5)}, or irrational numbers, or real numbers between -3 and 3 etc.
The set {15}.