Interpolation Is (Not Always) Easy to Spoil

Author Andrzej Tarlecki

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Andrzej Tarlecki
  • Institute of Informatics, University of Warsaw, Poland


Thanks to the anonymous reviewers for a number of useful comments.

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Andrzej Tarlecki. Interpolation Is (Not Always) Easy to Spoil. In 10th Conference on Algebra and Coalgebra in Computer Science (CALCO 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 270, pp. 8:1-8:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)


We study a version of the Craig interpolation theorem as formulated in the framework of the theory of institutions. This formulation proved crucial in the development of a number of key results concerning foundations of software specification and formal development. We investigate preservation of interpolation under extensions of institutions by new models and sentences. We point out that some interpolation properties remain stable under such extensions, even if quite arbitrary new models or sentences are permitted. We give complete characterisations of such situations for institution extensions by new models, by new sentences, as well as by new models and sentences, respectively.

Subject Classification

ACM Subject Classification
  • Theory of computation → Logic
  • Theory of computation → Logic and verification
  • interpolation
  • institutions
  • institutional abstract model theory
  • specification theory


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