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To the memory of Dr. Hans Pietsch (1907–1967)
The author wishes to thank ProfessorJürgen Schmidt for stimulating discussions and also ProfessorGeorge Grätzer for helpful remarks.
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Diener, KH. A remark on equational classes generated by very small free algebras. Arch. Math 20, 491–494 (1969). https://doi.org/10.1007/BF01899455
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DOI: https://doi.org/10.1007/BF01899455