The axis in the complex plane corresponding to zero real part, .
Imaginary Axis
See also
Complex Plane, Imaginary Line, Imaginary Part, Real AxisExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Imaginary Axis." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ImaginaryAxis.html