ph-math/src/main/java/com/helger/numbercruncher/mathutils/Complex.java
public Complex multiply (final Complex z)
  {
    return new Complex (m_fReal * z.real () -
                        m_fImaginary * z.imaginary (),
                        m_fReal * z.imaginary () + m_fImaginary * z.real ());
  }
public Complex multiply (final Complex z)
  {
    return new Complex (m_fReal * z.real () -
                        m_fImaginary * z.imaginary (),
                        m_fReal * z.imaginary () + m_fImaginary * z.real ());
  }
Multiply this complex number by another one.

@param z
the other complex number
@return a new complex number that is the product