Proof systems for Moss' coalgebraic logic

Marta Bílková, Alessandra Palmigiano*, Yde Venema

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


We study Gentzen-style proof theory of the finitary version of the coalgebraic logic introduced by L. Moss. The logic captures the behaviour of coalgebras for a large class of set functors. The syntax of the logic, defined uniformly with respect to a finitary coalgebraic type functor T, uses a single modal operator ∇T of arity given by the functor T itself, and its semantics is defined in terms of a relation lifting functor T. An axiomatization of the logic, consisting of modal distributive laws, has been given together with an algebraic completeness proof in work of C. Kupke, A. Kurz and Y. Venema.In this paper, following our previous work on structural proof theory of the logic in the special case of the finitary powerset functor, we present cut-free, one- and two-sided sequent calculi for the finitary version of Moss' coalgebraic logic for a general finitary functor T in a uniform way. For the two-sided calculi to be cut-free we use a language extended with the boolean dual of the nabla modality.

Original languageEnglish
Pages (from-to)36-60
Number of pages25
JournalTheoretical Computer Science
Issue numberC
Publication statusPublished - 1 Jan 2014
Externally publishedYes


  • Coalgebra
  • Coalgebraic logic
  • Completeness
  • Cover modality
  • Gentzen calculus
  • Modal logic
  • Sequent system


Dive into the research topics of 'Proof systems for Moss' coalgebraic logic'. Together they form a unique fingerprint.

Cite this