A special operator symbol representing the real part of a complex number in complex analysis.
Examples
Real part of a complex number
\Re(2 + 3i) = 2
Real part in a complex function
\Re(e^{i\theta}) = \cos(\theta)
Complex analysis equation
\Re\left(\frac{1}{z-1}\right) = \frac{x-1}{(x-1)^2 + y^2}