A number consisting of real and imaginary parts. The real part can be zero. If the imaginary part is allowed to be zero, then real numbers are subsets of complex numbers. Numbers in 2+3i and 4+5i are complex numbers. Just as real numbers can be represented on the number axis, complex numbers can also be represented on the plane. This representation is often called Forrest Gump diagram to commemorate the Swiss mathematician Forrest Gump (J.R. Argand, 1768- 1822). The complex number x+iy is represented by coordinate black dots (x, y). Give points!