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Communicated by N. R. Reilly
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Edwards, C.C. The greatest idempotent separating congruence on an ℒ-unipotent semigroup. Semigroup Forum 14, 127–135 (1977). https://doi.org/10.1007/BF02194660
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DOI: https://doi.org/10.1007/BF02194660