Equational properties of iterative monads

  • Authors:
  • Jiří Adámek;Stefan Milius;Jiří Velebil

  • Affiliations:
  • Institut für Theoretische Informatik, Technische Universität Braunschweig, Germany;Institut für Theoretische Informatik, Technische Universität Braunschweig, Germany;Faculty of Electrical Engineering, Czech Technical University, Prague, Czech Republic

  • Venue:
  • Information and Computation
  • Year:
  • 2010

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Abstract

Iterative monads of Calvin Elgot were introduced to treat the semantics of recursive equations purely algebraically. They are Lawvere theories with the property that all ideal systems of recursive equations have unique solutions. We prove that the unique solutions in iterative monads satisfy all the equational properties of iteration monads of Stephen Bloom and Zoltan Esik, whenever the base category is hyper-extensive and locally finitely presentable. This result is a step towards proving that functorial iteration monads form a monadic category over sets in context. This shows that functoriality is an equational property when considered w.r.t. sets in context.