#mathematical_product__product  a quantity obtained by multiplication; "the product of 2 and 3 is 6"
  supertype:  #quantity  something that has a magnitude and can be represented in mathematical expressions by a constant or a variable
  subtype:  #factorial  the product of all the integers up to and including a given integer; "1, 2, 6, 24, and 120 are factorials"
  subtype:  #multiple  the product of a quantity by an integer; "36 is a multiple of 9"
     subtype:  #double  a quantity that is twice as great as another; "36 is the double of 18"
     subtype:  #triple  a quantity that is three times as great as another
     subtype:  #quadruple  a quantity that is four times as great as another
     subtype:  #lowest_common_multiple__least_common_multiple__lcm  the smallest multiple that is exactly divisible by every member of a set of numbers; "the least common multiple of 12 and 18 is 36"

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