Join in a lattice
= Join in a lattice
{title2=$a\vee b$}
The join of two elements of a <lattice> is their <least upper bound>. In a <lattice> of closed <set families>, it is the closure of their union.
= Join in a lattice
{title2=$a\vee b$}
The join of two elements of a <lattice> is their <least upper bound>. In a <lattice> of closed <set families>, it is the closure of their union.