`conj', `real', `imag'
----------------------

real(COMP)
     :: Real part of COMP.

imag(COMP)
     :: Imaginary part of COMP.

conj(COMP)
     :: Complex conjugate of COMP.

RETURN COMP
     complex number

   * Basic operations for complex numbers.

   * These functions works also for polynomials with complex
     coefficients.

     [111] A=(2+@i)^3;
     (2+11*@i)
     [112] [real(A),imag(A),conj(A)];
     [2,11,(2-11*@i)]

