Find the closure of the following set in C
{z∈C : (ReZ)2=ImZ}
The set is a curve in C\mathbb{C}C. Thus, it is closed, since the set coincides with its boundary. Since the set is closed, the closure of the set is the set itself, i.e., {z∈C:(Rez)2=Imz}\{z\in{\mathbb{C}}:(Re z)^2=Im z\}{z∈C:(Rez)2=Imz}.
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