Course-of-Value Induction in Cedille
Abstract
In the categorical setting, histomorphisms model a course-of-value recursion scheme that allows functions to be defined using arbitrary previously computed values. In this paper, we use the Calculus of Dependent Lambda Eliminations (CDLE) to derive a lambda-encoding of inductive datatypes that admits course-of-value induction. Similar to course-of-value recursion, course-of-value induction gives access to inductive hypotheses at arbitrary depth of the inductive arguments of a function. We show that the derived course-of-value datatypes are well-behaved by proving Lambek's lemma and characterizing the computational behavior of the induction principle. Our work is formalized in the Cedille programming language and also includes several examples of course-of-value functions.
Keywords
Cite
@article{arxiv.1811.11961,
title = {Course-of-Value Induction in Cedille},
author = {Denis Firsov and Larry Diehl and Christopher Jenkins and Aaron Stump},
journal= {arXiv preprint arXiv:1811.11961},
year = {2019}
}