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    • Semigroup and category-theoretic approaches to partial symmetry 

      Wallis, Alistair R. (Heriot-Watt University Mathematical and Computer Sciences, 2013-07)
      This thesis is about trying to understand various aspects of partial symmetry using ideas from semigroup and category theory. In Chapter 2 it is shown that the left Rees monoids underlying self-similar group actions are ...