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Notice: Trying to access array offset on value of type null in /var/www/html/wiki/includes/profiler/SectionProfiler.php on line 101 Edu:Rigidity - IAOA Wiki
1. Rigidity is a property of relations/properties, a meta-property. It is defined in terms of modal logic.
A property of an entity is essential to that entity if it must be true of it in every possible world, i.e. if it necessarily holds for that entity.
A property is rigid if it is essential to all its possible instances; an instance of a rigid property cannot stop being an instance of that property in a different world.
Commentary
Rigidity as a meta-property is not “inherited” by sub-properties of properties that carry it. [ Guarino & Welty, 2003(?) ]
