sumo#number
  supertype:  pm#atomic_ADT__atomic_abstract_data_type (pm)
  equal:  kif#number (pm)
  subtype:  sumo#real_number  a number that can be expressed as a (possibly infinite) decimal, i.e. a number that has a position on the number line
     subtype:  sumo#rational_number  real_number that is the product of dividing two integers
        subtype:  sumo#integer  a negative or nonnegative whole number
           subtype:  sumo#nonnegative_integer__nonnegativeinteger  integer >= 0
              subtype:  sumo#positive_integer  integer > 0
              subtype:  kif#zero  class containing only 0
           subtype:  sumo#negative_integer  integer < 0
           subtype:  sumo#even_integer  integer that is evenly divisible by 2
           subtype:  sumo#odd_integer__oddinteger  integer that is not evenly divisible by 2
           subtype:  sumo#prime_number__primenumber
     subtype:  sumo#irrational_number
     subtype:  sumo#nonnegative_real_number  real_number >= 0
        subtype:  sumo#nonnegative_integer__nonnegativeinteger  integer >= 0
        subtype:  sumo#positive_real_number  real_number > 0
           subtype:  sumo#positive_integer  integer > 0
     subtype:  sumo#negative_real_number  real_number < 0
        subtype:  sumo#negative_integer  integer < 0
     subtype:  sumo#binary_number  elements from the number system with base 2; every binary_number is expressed as a sequence of the digits 1 and 0
     subtype:  xsd#decimal
  subtype:  sumo#imaginary_number__imaginarynumber  a number that is the result of multiplying a real_number by the square root of -1
  subtype:  sumo#complex_number__complexnumber  a number that has the form: x + yi, where x and y are real_numbers and i is the square root of -1

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