Strong Progress for Session-Typed Processes in a Linear Metalogic with Circular Proofs

We introduce an infinitary first order linear logic with least and greatest fixed points. To ensure cut elimination, we impose a validity condition on infinite derivations. Our calculus is designed to reason about rich signatures of mutually defined inductive and coinductive linear predicates. In a major case study we use it to prove the strong progress property for binary session-typed processes under an asynchronous communication semantics. As far as we are aware, this is the first proof of this property.

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