Refining Constructive Hybrid Games

Authors Rose Bohrer , André Platzer

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Author Details

Rose Bohrer
  • Carnegie Mellon University, Pittsburgh, PA, USA
André Platzer
  • Carnegie Mellon University, Pittsburgh, PA, USA
  • Technische Universität München, Germany


We thank Jon Sterling for suggestions regarding our choice of type theory and for references to the literature. We thank the anonymous reviewers for their helpful feedback.

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Rose Bohrer and André Platzer. Refining Constructive Hybrid Games. In 5th International Conference on Formal Structures for Computation and Deduction (FSCD 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 167, pp. 14:1-14:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020)


We extend the constructive differential game logic (CdGL) of hybrid games with a refinement connective that relates two hybrid games. In addition to CdGL’s ability to prove the existence of winning strategies for specific postconditions of hybrid games, game refinements relate two games to one another. That makes it possible to prove that any winning strategy for any postcondition of one game carries over to a winning strategy for the other. Since CdGL is constructive, a computable winning strategy can be extracted from a proof that a player wins a game. A folk theorem says that any such winning strategy for a hybrid game gives rise to a corresponding hybrid system satisfying the same property. We make this precise using CdGL’s game refinements and prove correct the construction of hybrid systems from winning strategies of hybrid games.

Subject Classification

ACM Subject Classification
  • Theory of computation → Logic and verification
  • Theory of computation → Type theory
  • Hybrid Games
  • Constructive Logic
  • Refinement
  • Game Logic


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