Representing Nonterminating Rewriting with $\mathbf{F}_2^\mu$

Peng Fu

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arXiv · 1706.00746

Representing Nonterminating Rewriting with $\mathbf{F}_2^\mu$

Peng Fu

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Abstract

We specify a second-order type system $\mathbf{F}_2^\mu$ that is tailored for representing nonterminations. The nonterminating trace of a term $t$ in a rewrite system $\mathcal{R}$ corresponds to a productive inhabitant $e$ such that $\Gamma_{\mathcal{R}} \vdash e : t$ in $\mathbf{F}_2^\mu$, where $\Gamma_{\mathcal{R}}$ is the environment representing the rewrite system. We prove that the productivity checking in $\mathbf{F}_2^\mu$ is decidable via a mapping to the $\lambda$-Y calculus. We develop a type checking algorithm for $\mathbf{F}_2^\mu$ based on second-order matching. We implement the type checking algorithm in a proof-of-concept type checker.

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Peng Fu. 2017-06-02. Representing Nonterminating Rewriting with $\mathbf{F}_2^\mu$. https://arxiv.org/abs/1706.00746

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