Congruence join semidistributivity is equivalent to a congruence identity
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We show that a locally finite variety is congruence join semidistributive if and only if it satisfies a congruence identity that is strong enough to force join semidistributivity in any lattice.
Key words and phrases: Congruence identity, congruence variety, join semidistributive lattice, herringbone.
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© Birkhäuser Verlag Basel, 2001