Abstract We construct an algebraic distributive lattice D that is not isomorphic to the congruence lattice of any lattice. This solves a long-standing open problem, traditionally attributed to R.P. Dilworth, from the forties. The lattice D has a compact top element and ?+1 compact elements. Our results extend to any algebra possessing a congruence-compatible structure of a join-semilattice with a largest element.
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