Historically, who first studied semilattices, as opposed to lattices or Boolean algebras? (With or without identity, I do not mind.)
2026-03-25 14:21:18.1774448478
Who first studied semilattices?
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It appears Grigore Moisil was first. Here's a review of his 1937 paper Recherches Sur le Principe d'Identite.
The review says he studied them under the name of tautological groups. This source says it was "logical groups", but it is less specific so I'm guessing the review is what's right. I don't have access to the actual paper. The book also mentions a Fritz Klein who introduced the term "Halbverband" in German, but that seems to have been in 1939 according to Clifford's footnote here.