pm#irreflexive_relation_type  r is irreflexive if r(?i,?i) holds for no value of ?i
  subtype:  pm#asymmetric_relation_type  an antisymmetric and irreflexive relation
  instance:  pm#irreflexive_relation  pm#inverse  sumo#successor_attribute_closure  sumo#front_fn  sumo#back_fn  sumo#attribute  sumo#manner  sumo#less_than  sumo#greater_than  sumo#increases_likelihood  sumo#decreases_likelihood  sumo#in_list  sumo#inhibits  sumo#prevents  sumo#sub_proposition  sumo#sub_plan  sumo#larger  sumo#smaller  sumo#starts  sumo#finishes  sumo#before  sumo#during  sumo#earlier  sumo#meets_spatially  sumo#overlaps_partially  sumo#superficial_part  sumo#connected_engineering_components  sumo#ancestor  sumo#sibling  sumo#brother  sumo#sister  sumo#spouse  sumo#husband  sumo#wife  sumo#modal_attribute
  equal:  sumo#irreflexive_relation (pm)
  supertype:  pm#binary_relation_type  all binary relation types are instance of that object
     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
        supertype:  pm#1st_order_type__1stordertype__type1  all 1st order types are implicitely or explicitely instance of that 2nd-order type
           supertype:  pm#type  second-order type or more
              supertype:  pm#non_spatial_collection__nonspatialcollection__true_collection  something gathering separated things (entities/situations) and that is not a spatial object
                 supertype:  pm#non_spatial_object_that_is_not_an_attribute_or_quality_or_measure
                    supertype:  pm#non_spatial_object__nonspatialobject  abstraction or description content/medium/container (a description medium that has some spatial feature is both instance of sumo#object and pm#non_spatial_object
                       supertype:  pm#entity  something that can be "involved" in a situation
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                       supertype:  cyc#intangible  The collection of things that are not physical -- are not made of, or encoded in, matter. Every cyc#Collection is a cyc#intangible (even if its instances are tangible), and so are some cyc#individuals.  Caution: do not confuse `tangibility' with `perceivability' -- humans can perceive light even though it's intangible--at least in a sense.
                          supertype:  cyc#partially_intangible__partiallyintangible  The collection of things that either are wholly intangible (see cyc#Intangible) or have at least one intangible (i.e. immaterial) part (see cyc#intangibleParts). This includes intangible individuals, such as instances of cyc#Number-General  or cyc#Agreement, as well as non-individuals (all of which are intangible), i.e. instances of cyc#SetOrCollection.  It also includes things that have both tangible and intangible components (see cyc#CompositeTangibleAndIntangibleObject),  such as a printed copy of a newspaper (as its information content is intangible) or a person (as her mental states are intangible).
                             supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
                 supertype:  pm#collection  something gathering separated things (entities/situations)
                    supertype:  pm#divisible_entity__divisibleentity  many classifications under this category are application-dependant
                       supertype:  pm#entity  something that can be "involved" in a situation
                       supertype:  pm#divisible_thing__divisiblething
                          supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
              supertype:  sumo#abstract__entity_without_spatial_feature  e.g., knowledge, motivation, measure; properties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium; instances of sumo#abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place or time without some physical encoding or embodiment
                 supertype:  pm#non_spatial_object__nonspatialobject  abstraction or description content/medium/container (a description medium that has some spatial feature is both instance of sumo#object and pm#non_spatial_object

No statement uses or specializes pm#irreflexive_relation_type; click here to add one.