#logarithm__log  the exponent required to produce a given number
  supertype:  #exponent.mathematical_notation__power__index  a mathematical notation indicating the number of times a quantity is multiplied by itself
  subtype:  #common_logarithm  a logarithm to the base 10
  subtype:  #natural_logarithm__naturallogarithm__Napierian_logarithm  a logarithm to the base e

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