Highlights in infinitary rewriting and lambda calculus

  • Authors:
  • Jörg Endrullis;Dimitri Hendriks;Jan Willem Klop

  • Affiliations:
  • -;-;-

  • Venue:
  • Theoretical Computer Science
  • Year:
  • 2012

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Abstract

We present some highlights from the emerging theory of infinitary rewriting, both for first-order term rewriting systems and @l-calculus. In the first section we introduce the framework of infinitary rewriting for first-order rewrite systems, so without bound variables. We present a recent observation concerning the continuity of infinitary rewriting. In the second section we present an excursion to the infinitary @l-calculus. After the main definitions, we mention a recent observation about infinite looping @l-terms, that is, terms that reduce in one step to themselves. Next we describe the fundamental trichotomy in the semantics of @l-calculus: Bohm trees, Levy-Longo trees, and Berarducci trees. We conclude with a short description of a new refinement of Bohm tree semantics, called clocked semantics.