lattice

partially ordered set that admits greatest lower and least upper bounds of any two elements

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Commons category: Lattice theory
Commons gallery: Lattice (order)

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Y indicates that the column's property is always true for the row's term (at the very left), while ✗ indicates that the property is not guaranteed in general (it might, or might not, hold). For example, that every equivalence relation is symmetric, but not necessarily antisymmetric, is indicated by Y in the "Symmetric" column and ✗ in the "Antisymmetric" column, respectively. All definitions tacitly require the homogeneous relation