In a common dictionary, the term similarity is typically defined as a quality of “having characteristics in common” or being “alike in substance or essentials” (Webster’s Third New International Dictionary). According to this definition, two entities are considered similar if they are equal or, at least, comparable in some of their properties, but not necessarily in all of them. In addition, it is assumed that the properties in which the two entities are equal have some significance in a given context. Different kinds of similarities can thus be defined for a set of entities, depending upon the properties that are considered significant for a particular purpose.
KeywordsBehavior System Original System Modelling Relationship Source System Planar Figure
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