Bert Lindenhovius ; Michael Mislove ; Vladimir Zamdzhiev - LNL-FPC: The Linear/Non-linear Fixpoint Calculus

lmcs:5703 - Logical Methods in Computer Science, April 22, 2021, Volume 17, Issue 2 -
LNL-FPC: The Linear/Non-linear Fixpoint Calculus

Authors: Bert Lindenhovius ; Michael Mislove ; Vladimir Zamdzhiev

We describe a type system with mixed linear and non-linear recursive types called LNL-FPC (the linear/non-linear fixpoint calculus). The type system supports linear typing, which enhances the safety properties of programs, but also supports non-linear typing as well, which makes the type system more convenient for programming. Just as in FPC, we show that LNL-FPC supports type-level recursion, which in turn induces term-level recursion. We also provide sound and computationally adequate categorical models for LNL-FPC that describe the categorical structure of the substructural operations of Intuitionistic Linear Logic at all non-linear types, including the recursive ones. In order to do so, we describe a new technique for solving recursive domain equations within cartesian categories by constructing the solutions over pre-embeddings. The type system also enjoys implicit weakening and contraction rules that we are able to model by identifying the canonical comonoid structure of all non-linear types. We also show that the requirements of our abstract model are reasonable by constructing a large class of concrete models that have found applications not only in classical functional programming, but also in emerging programming paradigms that incorporate linear types, such as quantum programming and circuit description programming languages.

Volume: Volume 17, Issue 2
Published on: April 22, 2021
Submitted on: August 22, 2019
Keywords: Computer Science - Programming Languages,Computer Science - Logic in Computer Science,Mathematics - Category Theory


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