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Jason Z. S. Hu

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Preprint Oct 2026

Contravariant Universe Subtyping, Formalized, Mechanized

In a type theory with a cumulative universe hierarchy, \emph{subtyping} is often incorporated to lift lower universe levels to higher ones. In practice, kernels of proof assistants typically implement universe subtyping conservatively: subtyping only propagates covariantly into the output types of $\Pi$ types, while in...

Sheng-Yi Jiang, Jason Z. S. Hu · 0 citations
Review 2026

Nitro Isolation Engine: Formally Verifying a Production Hypervisor (Invited Talk)

This talk presents the experience applying interactive theorem proving to verify a production hypervisor component: the Nitro Isolation Engine, a trusted, minimalist computing base written in Rust, enforcing isolation between virtual machines on AWS Graviton5 EC2 instances.

Hanno Becker, Nathan Chong, Robert Dockins et al. · 0 citations

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