qqp question1: If real numbers are in [math]x[/math]-axis and complex numbers in [math]y[/math]-axis, what is in the [math]z[/math]-axis? question2: If the real numbers are usually placed on the [math]x[/math]-axis and imaginary numbers placed on the [math]y[/math]-axis, what would be placed on the [math]z[/math]-axis?