A Note on Maximal Hierarchies
β
Sebastian BΓΆcker; Andreas W.M. Dress
π
Article
π
2000
π
Elsevier Science
π
English
β 134 KB
Given a (finite or infinite) set X, a collection C P(X ) of subsets of X is called a hierarchy if it satisfies the condition ` '' In this note, we characterize maximal hierarchies as set systems that contain the empty set, the full set, and all one-element sets, and in addition satisfy either one of