Laboratoire de l'Informatique et du Parallélisme » Linear Arithmetic

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\title{Free-cut elimination in linear logic and an application to a feasible arithmetic\footnote{

This work was supported by by the ANR Project ELICA ANR-14-CE25-0005 and by the LABEX MILYON (ANR-10-LABX-0070) of Universit\'e de Lyon, within the program "Investissements d'Avenir" (ANR-11-IDEX-

0007) operated by the French National Research Agency (ANR).}

}

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\author{Patrick Baillot}

\author{Anupam Das}

\affil{Univ Lyon, CNRS, ENS de Lyon, UCB Lyon 1, LIP

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\subjclass{F.4.1 Mathematical Logic.}

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\keywords{proof theory, linear logic, bounded arithmetic, polynomial time computation, implicit computational complexity}

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%\EventLongTitle{42nd Conference on Very Important Topics (CVIT 2016)}

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\maketitle

\begin{abstract}

We prove a general form of `free-cut elimination' for first-order theories in linear logic, yielding normal forms of proofs where cuts are anchored to nonlogical steps. To demonstrate the usefulness of this result, we consider a version of arithmetic in linear logic, based on a previous axiomatisation by Bellantoni and Hofmann. We prove a witnessing theorem for a fragment of this arithmetic via the `witness function method', showing that the provably convergent functions are precisely the polynomial-time functions. The programs extracted are implemented in the framework of `safe' recursive functions, due to Bellantoni and Cook, where the ! modality of linear logic corresponds to normal inputs of a safe recursive program. 

%We conclude with some comments for further applications of the free-cut elimination result. 

 \end{abstract}

\input{introduction}

\input{preliminaries}

\input{free-cut-elim}

\input{arithmetic}

\input{bc}

\input{bc-convergence}

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\input{conclusions}

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