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We show that the class of Contact join-semilattices, as introduced by T.Ivanova, is not finitely axiomatizable. On the other hand, a simple finiteaxiomatization exists for the class of those join semilattices with a weakcontact relation which can be embedded into the reduct of a Boolean algebra(equivalently, a distributive lattice) with a weak contact relation.

Contact join-semilattices are not finitely axiomatizable