#complex_number__complexnumber__complex_quantity__complexquantity__imaginary_number__imaginarynumber  a number of the form a+bi where a and b are real numbers and i is the square root of -1
  supertype:  number  a concept of quantity derived from zero and units; "every number has a unique position in the sequence"
  subtype:  real_number  pure_imaginary_number
  part:  imaginary_part_of_a_complex_number__imaginary_part__imaginarypart  the part of a complex number that has the square root of -1 as a factor

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