#arithmetic_operation  a mathematical operation involving numbers
  supertype:  mathematical_process__mathematical_operation__operation  calculation by mathematical methods; "the problems at the end of the chapter demonstrated the mathematical processes involved in the derivation"; "they were learning the basic operations of arithmetic"
  subtype:  division.arithmetic_operation  an arithmetic operation that is the inverse of multiplication; the quotient of two numbers is computed
     subtype:  long_division  the operation of division in which the sequence of steps are indicated in detail
     subtype:  short_division__shortdivision  the operation of division in which the sequence of steps is performed without writing them out
  subtype:  times__time__multiplication  an arithmetic operation that is the inverse of division; the product of two numbers is computed; "the multiplication of four by three gives twelve"; "four times three equals twelve"
  subtype:  minus__minu__subtraction  an arithmetic operation in which the difference between two numbers is calculated; "the subtraction of three from four leaves one"; "four minus three equals one"
  subtype:  summation__addition__plus  the arithmetic operation of summing; calculating the sum of two or more numbers; "the summation of four and three gives seven"; "four plus three equals seven"

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