pm#unary_constant_function_quantity_type  unary function that maps from sumo#constant_quantity to the same class
  supertype:  pm#function_quantity_type  pm#unary_function_type
  equal:  sumo#unary_constant_function_quantity (pm)
  subtype:  pm#time_dependent_quantity_type  a unary_constant_function of continuous time; all instances of this class map a time quantity into another constant_quantity such as temperature; for example, 'the temperature at the top of the Empire State Building' is a time_dependent_quantity since its value depends on the time

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