NESTED SET

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Charles François (2004). NESTED SET. International Encyclopedia of Systems and Cybernetics, 2(2): 2249.

Collection	International Encyclopedia of Systems and Cybernetics
Year	2004
Vol. (num.)	2(2)
ID	◀ 2249 ▶
Object type	Methodology or model

Any set which is contained in another set.

This is a rigorous condition in hierarchies, when every element of the lower order set must be included within the higher one.