Abstract.
We give an example of a five-element unary algebra which is entropic but does not admit a natural duality.
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Received September 26, 2000; accepted in final form April 4, 2001.
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Pitkethly, J., Davey, B. A non-dualisable entropic algebra. Algebra univers. 47, 51–54 (2002). https://doi.org/10.1007/s00012-002-8173-4
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DOI: https://doi.org/10.1007/s00012-002-8173-4