arXiv subjects

Valentin Maestracci

Publications and source records attributed to Valentin Maestracci.

3 recordsLinked to original sources

arXiv2024

The Lambda Calculus is Quantifiable

In this paper we introduce several quantitative methods for the lambda-calculus based on partial metrics, a well-studied variant of standard metric spaces that have been used to metrize non-Hausdorff topologies, like those arising from Scott domains. First, we study quantitative variants, based on program distances, of sensible equational theories for the $λ$-calculus, like those arising from Böhm trees and from the contextual preorder. Then, we introduce applicative distances capturing higher-order Scott topologies, including reflexive objects like the $D_\infty$ model. Finally, we provide a quantitative insight on the well-known connection between the Böhm tree of a $λ$-term and its Taylor expansion, by showing that the latter can be presented as an isometric transformation.

cs.LO↗

arXiv2023

Linear Realisability and Cobordisms

Cobordism categories are known to be compact closed. They can therefore be used to define non-degenerate models of multiplicative linear logic by combining the Int construction with double glueing. In this work we detail such construction in the case of low-dimensional cobordisms, and exhibit a connexion between those models and the model of Interaction graphs introduced by Seiller. In particular, we exhibit how the so-called trefoil property is a consequence of the associativity of composition of higher structures, providing a first step toward establishing models as obtained from a double glueing construction. We discuss possible extensions to higher-dimensional cobordisms categories

cs.LO↗

arXiv2021

Implementation of Two Layers Type Theory in Dedukti and Application to Cubical Type Theory

In this paper, we make a substantial step towards an encoding of Cubical Type Theory (CTT) in the Dedukti logical framework. Type-checking CTT expressions features a decision procedure in a de Morgan algebra that so far could not be expressed by the rewrite rules of Dedukti. As an alternative, 2 Layer Type Theories are variants of Martin-Löf Type Theory where all or part of the definitional equality can be represented in terms of a so-called external equality. We propose to split the encoding by giving an encoding of 2 Layer Type Theories (2LTT) in Dedukti, and a partial encoding of CTT in 2LTT.

cs.LO↗