CONTENTS 1. Introduction........................................................................................................................5 2. Definition, basic examples and properties of multisemilattices...........................................6 3. The subdirectly irreducibles..............................................................................................13 4. The lattice of subvarieties of $D_n$.................................................................................18 5. Subvarieties of $D_n$ defined by identities involving at most two operation symbols......24 6. Some further comments and open problems....................................................................34 References...........................................................................................................................40
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