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A Certifying Extraction with Time Bounds from Coq to Call-By-Value Lambda Calculus

Authors Yannick Forster, Fabian Kunze

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Yannick Forster
  • Saarland University, Saarland Informatics Campus (SIC), Saarbrücken, Germany
Fabian Kunze
  • Saarland University, Saarland Informatics Campus (SIC), Saarbrücken, Germany

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Yannick Forster and Fabian Kunze. A Certifying Extraction with Time Bounds from Coq to Call-By-Value Lambda Calculus. In 10th International Conference on Interactive Theorem Proving (ITP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 141, pp. 17:1-17:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019) https://doi.org/10.4230/LIPIcs.ITP.2019.17

Abstract

We provide a plugin extracting Coq functions of simple polymorphic types to the (untyped) call-by-value lambda calculus L. The plugin is implemented in the MetaCoq framework and entirely written in Coq. We provide Ltac tactics to automatically verify the extracted terms w.r.t a logical relation connecting Coq functions with correct extractions and time bounds, essentially performing a certifying translation and running time validation. We provide three case studies: A universal L-term obtained as extraction from the Coq definition of a step-indexed self-interpreter for L, a many-reduction from solvability of Diophantine equations to the halting problem of L, and a polynomial-time simulation of Turing machines in L.

Subject Classification

ACM Subject Classification
  • Theory of computation → Type theory
  • Mathematics of computing → Lambda calculus
Keywords
  • call-by-value
  • lambda calculus
  • Coq
  • constructive type theory
  • extraction
  • computability

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References

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