J. Austral. Math. Soc.  73 (2002), 187-219
Strong and full dualisability: three-element unary algebras

J. G. Pitkethly
  La Trobe University
  Victoria 3086

We characterise the strongly dualisable three-element unary algebras and show that every fully dualisable three-element unary algebra is strongly dualisable. It follows from the characterisation that, for dualisable three-element unary algebras, strong dualisability is equivalent to a weak form of injectivity.
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