Quantitative Kleene coalgebras

  • Authors:
  • Alexandra Silva;Filippo Bonchi;Marcello Bonsangue;Jan Rutten

  • Affiliations:
  • Centrum Wiskunde & Informatica, Science Park 123, 1098 XG Amsterdam, The Netherlands;CNRS, ENS-Lyon, 7 Passage Vercors, 69007 Lyon, France;Leiden Institute Advanced Computer Science, Niels Bohrweg 1, 2333 CA Leiden, The Netherlands and Centrum Wiskunde & Informatica, Science Park 123, 1098 XG Amsterdam, The Netherlands;Centrum Wiskunde & Informatica, Science Park 123, 1098 XG Amsterdam, The Netherlands and Vrije Universiteit Amsterdam, De Boelelaan 1081a, 1081 HV Amsterdam, The Netherlands and Radboud Universite ...

  • Venue:
  • Information and Computation
  • Year:
  • 2011

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Abstract

We present a systematic way to generate (1) languages of (generalised) regular expressions, and (2) sound and complete axiomatizations thereof, for a wide variety of quantitative systems. Our quantitative systems include weighted versions of automata and transition systems, in which transitions are assigned a value in a monoid that represents cost, duration, probability, etc. Such systems are represented as coalgebras and (1) and (2) above are derived in a modular fashion from the underlying (functor) type of these coalgebras. In previous work, we applied a similar approach to a class of systems (without weights) that generalizes both the results of Kleene (on rational languages and DFA's) and Milner (on regular behaviours and finite LTS's), and includes many other systems such as Mealy and Moore machines. In the present paper, we extend this framework to deal with quantitative systems. As a consequence, our results now include languages and axiomatizations, both existing and new ones, for many different kinds of probabilistic systems.