Definition of the 
  Mode and radiation angle is the two basic elements represented by the plural triangle, and the vector length corresponding to the plural is referred to as the magnitude of the plural, the vector and the real shaft The angle of the angle is the inclusion angle. The size of the radiation is infinite, but the radiomor is uniquely determined. 
  Due to a plural  can be determined by the ordered real number to , an ordered real number pair with a plane right angle coordinate system  Correspondingly, the plurality of points can be represented by the point  of the coordinates, at this time, the point of the  axis corresponds to the real number, The point of the  axis, the point on the  axis (except for origin) corresponds to the pure amount, namely the  axis is a virtual axis, as in this way The plane of the plural is called a complex. 
  multiple    is used to indicate  and  is vector in  axis. In this way, the plural  establishes a corresponding relationship with the vector  on the plane. 
  vector  is called the mode or absolute value of the plural , record , so 
   
 is not the original point, ie, multiple , vector  and  The angle of the axis is referred to as the radiation angle of the plural , which is recorded as . The symbols of the radiation are specified as: from the front-axis inverse clockwise direction to  is positive, and it is negative in  as a negative. Obviously a non-zero-recollection  has an endless multiple values, they differ in the integer multiple of , but  There is only one value  satisfying the condition , called  is the radio angle of the plural , records , So
  When , the radiation angle of  is meaningless. 
  Calculation of radioactor 
  multiple  of the main correspondence  and annectable primary value  has the following relationship: