pm#unary_constant_function_quantity_type unary function that maps from sumo#constant_quantity to the same class
supertype: function_quantity_type unary_function_type
equal: unary_constant_function_quantity (pm)
subtype: 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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