TCS 2010: Theoretical Computer Science pp 165-181

The Duality of Computation under Focus

  • Pierre-Louis Curien
  • Guillaume Munch-Maccagnoni
Part of the IFIP Advances in Information and Communication Technology book series (IFIPAICT, volume 323)


We review the relationship between abstract machines for (call-by-name or call-by-value) λ-calculi (extended with Felleisen’s \(\mathcal C\)) and sequent calculus, reintroducing on the way Curien-Herbelin’s syntactic kit of the duality of computation. We provide a term language for a presentation of LK (with conjunction, disjunction, and negation), and we transcribe cut elimination as (non confluent) rewriting. A key slogan, which may appear here in print for the first time, is that commutative cut elimination rules are explicit substitution propagation rules. We then describe the focalised proof search discipline (in the classical setting), and narrow down the language and the rewriting rules to a confluent calculus (a variant of the second author’s focalising system L). We then define a game of patterns and counterpatterns, leading us to a fully focalised finitary syntax for a synthetic presentation of classical logic, that provides a quotient on (focalised) proofs, abstracting out the order of decomposition of negative connectives.

Copyright information

© IFIP 2010

Authors and Affiliations

  • Pierre-Louis Curien
    • 1
  • Guillaume Munch-Maccagnoni
    • 2
  1. 1.CNRS, Paris 7, and INRIA 
  2. 2.Paris 7, and INRIA 

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