Must Preorder in Non-deterministic Untyped -calculus

This paper studies the interplay between functional application and nondeter-ministic choice in the context of untyped-calculus. We introduce an operational semantics which is based on the idea of must preorder, coming from the theory of process algebras. To characterize this relation, we build a model using the classical inverse limit construction, and we prove it fully abstract using a generalization of BB ohm trees.

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