Weak normalization implies strong normalization in pure type systems

Formal proof listed 1 paper September 25, 2026
What the paper claims, in its own words

Proves that weak normalization implies strong normalization for every pure type system: if every legal expression in every valid context has a β-normal form, every β-reduction sequence terminates. This resolves the β-Barendregt–Geuvers–Klop conjecture, including nonfunctional rules and open contexts.

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The original paper