semilattice (suomeksi)

Määritelmät:

(lb, en, mathematics) A partially ordered set that either has a join (a least upper bound) for any nonempty finite subset (a ''join-semilattice'' or ''upper semilattice'') or has a meet (or greatest lower bound) for any nonempty finite subset (a ''meet-semilattice'' or ''lower semilattice'').