Abstract.
We examine the varieties of semilattices (called CSL’s) with an additional closure operator treated as a unary operation. Topics investigated include the word problem in free CSL’s, the lattice of CSL varieties, the finite basis problem for the identities of finite CSL’s and a representation as intersection closed subsets of topological spaces.
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Received September 13, 2001; accepted in final form January 3, 2004.