Abstract
There is an incomplete atomic relation algebra which is not the reduct of any 4-dimensional cylindric algebra. This completes the answer to a problem in [Mo61].
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References
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Maddux, R.D. A relation algebra which is not a cylindric reduct. Algebra Universalis 27, 279–288 (1990). https://doi.org/10.1007/BF01182461
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DOI: https://doi.org/10.1007/BF01182461