unlike Complex Number, real number system is not Algebraically Closed Field Re(x)Im(z)Re(x)\newline Im(z)Re(x)Im(z)Real Number TypeRational NumberIrrational Number What does $\mathrm{Re}(x)$ mean?I see this all the time in Mathematica output as well as in text, such as near the top of the Wikipedia Beta function page.https://math.stackexchange.com/questions/70246/what-does-mathrmrex-mean
