∞-Groupoid Generated by an Arbitrary Topological λ-Model

Abstract

\n The lambda calculus is a universal programming language. It can represent the computable functions, and such offers a formal counterpart to the point of view of functions as rules. Terms represent functions and this allows for the application of a term/function to any other term/function, including itself. The calculus can be seen as a formal theory with certain pre-established axioms and inference rules, which can be interpreted by models. Dana Scott proposed the first non-trivial model of the extensional lambda calculus, known as $ D_{\\infty }$, to represent the $\\lambda $-terms as the typical functions of set theory, where it is not allowed to apply a function to itself. Here we propose a construction of an $\\infty $-groupoid from any lambda model endowed with a topology. We apply this construction for the particular case $D_{\\infty }$, and we see that the Scott topology does not provide enough information about the relationship between higher homotopies. This motivates a new line of research focused on the exploration of $\\lambda $-models with the structure of a non-trivial $\\infty $-groupoid to generalize the proofs of term conversion (e.g., $\\beta $-equality, $\\eta $-equality) to higher-proofs in $\\lambda $-calculus.