English: Shows a directed set (i.e. each two members have a common upper bound) w.r.t. the partial order "bitwise ≤" on 4-bit numbers, which is not a join-semilattice (since 1000 and 0001 have no least common upper bound).
{{Information
|Description ={{en|1=Shows a directed set (i.e. each two members have a common upper bound) w.r.t. the partial order "bitwise ≤" on 4-bit numbers, which is not a join-semilattice (since 1000 and 0001 have no least common upper bound)...