Abstract.
A finite unary algebra with a positive primitive formula defining a pp-acyclic relation does not have enough algebraic operations and does not have a finite basis for its quasi-equations.
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In Celebration of the Sixtieth Birthday of Ralph N. McKenzie
Received June 17, 2003; accepted in final form August 12, 2004.
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Hyndman, J. Positive primitive formulas preventing enough algebraic operations. Algebra univers. 52, 303–312 (2005). https://doi.org/10.1007/s00012-004-1896-7
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DOI: https://doi.org/10.1007/s00012-004-1896-7