hierarchical classification
classification system based on hierarchical rules
arithmetical hierarchy
hierarchy which classifies certain sets based on the complexity of formulas that define them
analytical hierarchy
extension of the arithmetical hierarchy
taxonomy
classification of things or concepts, as well as to the principles underlying such a classification, categorization is based on discrete sets, different from meronymy which is dealing with the classification of parts of a whole
Boolean hierarchy
hierarchy of complexity classes that can be constructed as boolean combinations of problems in the class NP