A containment hierarchy is a hierarchical collection of strictly nested sets. Each entry in the hierarchy designates a set of which the previous entry is a strict superset, and the next entry is a strict subset. For example, all rectangles are quadrilaterals, but not all quadrilaterals are rectangles, and all squares are rectangles, but not all rectangles are squares. A hierarchy of this kind is to be contrasted with a more general notion of a partially ordered set.
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- A containment hierarchy is a hierarchical collection of strictly nested sets. Each entry in the hierarchy designates a set of which the previous entry is a strict superset, and the next entry is a strict subset. For example, all rectangles are quadrilaterals, but not all quadrilaterals are rectangles, and all squares are rectangles, but not all rectangles are squares. A hierarchy of this kind is to be contrasted with a more general notion of a partially ordered set. A taxonomy is a classic example of a containment hierarchy: In geometry: shape -> polygon -> quadrilateral -> rectangle -> square In biology: animal -> bird -> raptor -> eagle -> golden eagle The Chomsky hierarchy in formal languages: recursively enumerable -> context-sensitive -> context-free -> regular In physics: particle -> elementary particle -> fermion -> lepton -> electron In philosophy: abstract -> concept -> idea -> application -> concrete
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- A containment hierarchy is a hierarchical collection of strictly nested sets. Each entry in the hierarchy designates a set of which the previous entry is a strict superset, and the next entry is a strict subset. For example, all rectangles are quadrilaterals, but not all quadrilaterals are rectangles, and all squares are rectangles, but not all rectangles are squares. A hierarchy of this kind is to be contrasted with a more general notion of a partially ordered set.
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