pm#ternary_relation_type  relates three items
  exclusion:  pm#binary_relation_type  pm#quaternary_relation_type  pm#quintary_relation_type  pm#variable_arity_relation_type
  supertype:  pm#relation_type  there are three kinds of relation(_types): pm#predicate_type, pm#function_type and sumo#list; both predicates and functions denote sets of ordered n-tuples; the difference between these two classes is that predicates cover formula-forming operators, while functions cover term-forming operators; a list, on the other hand, is a particular ordered n-tuple
  instance of:  pm#class_of_inheritable_relation_type
  equal:  sumo#ternary_relation (pm)
  subtype:  pm#ternary_predicate_type__ternarypredicatetype  class of predicates that require exactly three arguments
     instance:  sumo#domain  sumo#domain_subclass
     instance:  sumo#related_external_concept (pm#string,?,sumo#language)  used to signify a three-place relation between a concept in an external knowledge source, a concept in the SUMO, and the name of the other knowledge source
        subtype:  sumo#synonymous_external_concept (pm#string,?,sumo#language)  the 2nd argument has the same meaning as the 1st in the language denoted by the 3rd argument
        subtype:  sumo#subsumed_external_concept (pm#string,?,sumo#language)  the 2nd argument is subsumed by the 1st in the language denoted by the 3rd argument
        subtype:  sumo#subsuming_external_concept (pm#string,?,sumo#language)  the 2nd argument subsumes the 1st in the language denoted by the 3rd argument
     instance:  sumo#conditional_probability__conditionalprobability  sumo#prefers__prefer  sumo#capability  sumo#has_purpose_for_agent__haspurposeforagent  sumo#confers_norm__confersnorm  sumo#deprives_norm  sumo#between  sumo#represents_for_agent  sumo#represents_in_language  sumo#distance  sumo#temporally_between  sumo#temporally_between_or_equal  sumo#connects  sumo#orientation  sumo#occupies_position  sumo#point_of_intersection  sumo#geometric_distance__geometricdistance
  subtype:  pm#binary_function_type  class of functions requiring two arguments
     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
     instance:  pm#binary_function  sumo#list_order_fn  sumo#list_concatenate_fn  sumo#where_fn__wherefn  sumo#multiplication_fn  sumo#addition_fn  sumo#subtraction_fn__subtractionfn  sumo#division_fn  sumo#exponentiation_fn  sumo#log_fn__logfn  sumo#max_fn__maxfn  sumo#min_fn__minfn  sumo#remainder_fn__remainderfn  sumo#union_fn__unionfn  sumo#intersection_fn  sumo#relative_complement_fn  sumo#kappa_fn__kappafn  sumo#measure_fn__measurefn  sumo#interval_fn  sumo#per_fn__perfn  sumo#time_interval_fn  sumo#recurrent_time_interval_fn  sumo#month_fn__monthfn  sumo#day_fn__dayfn  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__editionfn  sumo#series_volume_fn  sumo#periodical_issue_fn  sumo#relative_time_fn

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