A mathematical operator representing the imaginary part of a complex number in complex analysis.
Examples
Imaginary part of a complex number
\Im(2 + 3i) = 3
Imaginary part of a complex function
\Im(e^{i\theta}) = \sin(\theta)
Image of a linear transformation
\Im(T) = \{y \in Y : y = T(x) \text{ for some } x \in X\}