plural of hierarchy

A body of authoritative officials organized in nested ranks.

Alternative form of hierarchical

plural of Chomsky hierarchy

plural of arithmetic hierarchy

plural of arithmetical hierarchy

plural of hierarchy of effects

(logic) arithmetical hierarchy

(logic) A hierarchy which classifies the complexity of first-order formulae (and sets defined by them) based on the number of alternations between series of unbounded existential quantifiers and universal quantifiers.

(computer science, linguistics) A containment hierarchy of classes of formal grammars. From least to most specialized, the classes are: recursively enumerable, context-sensitive, context-free, and regular.