pm#binary_function_type  class of functions requiring two arguments
  supertype:  pm#function_type  pm#ternary_relation_type
  instance of:  pm#class_of_inheritable_relation_type
  instance:  pm#binary_function  sumo#list_order_fn  sumo#list_concatenate_fn  sumo#where_fn  sumo#multiplication_fn  sumo#addition_fn  sumo#subtraction_fn  sumo#division_fn  sumo#exponentiation_fn  sumo#log_fn  sumo#max_fn  sumo#min_fn  sumo#remainder_fn  sumo#union_fn  sumo#intersection_fn  sumo#relative_complement_fn  sumo#kappa_fn  sumo#measure_fn  sumo#interval_fn  sumo#per_fn  sumo#time_interval_fn  sumo#recurrent_time_interval_fn  sumo#month_fn  sumo#day_fn  sumo#hour_fn  sumo#minute_fn  sumo#second_fn  sumo#temporal_composition_fn  sumo#mereological_sum_fn  sumo#mereological_product_fn  sumo#mereological_difference_fn  sumo#edition_fn  sumo#series_volume_fn  sumo#periodical_issue_fn  sumo#relative_time_fn
  equal:  sumo#binary_function (pm)
  subtype:  pm#associative_function_type  a binary function is associative if bracketing has no effect on the value returned by the function; more precisely, a function ?FUNCTION is associative just in case (?FUNCTION ?INST1 (?FUNCTION ?INST2 ?INST3)) is equal to (?FUNCTION (?FUNCTION ?INST1 ?INST2) ?INST3), for all ?INST1, ?INST2, and ?INST3
  subtype:  pm#commutative_function_type  a binary function is commutative if the ordering of the arguments of the function has no effect on the value returned by the function; more precisely, a function ?FUNCTION is commutative just in case (?FUNCTION ?INST1 ?INST2) is equal to (?FUNCTION ?INST2 ?INST1), for all ?INST1 and ?INST2

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