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Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 120 / 2 / e / Solution

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2023 iii Paper 120 2 e
2026-09-28  0 By others on same topic  0 Discussions Create my own version
No. The Omega combinator is
Ω=(λx.xx)(λx.xx).
(1)
Its only beta-redex contracts back to Ω itself. Every reduction sequence therefore repeats the same term, which is not in beta-normal form. Thus Ω has no beta-normal form.

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