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feat(untyped): standardization theorem for the lambda calculus#679

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m-ow wants to merge 3 commits into
leanprover:mainfrom
m-ow:standardization-theorem
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feat(untyped): standardization theorem for the lambda calculus#679
m-ow wants to merge 3 commits into
leanprover:mainfrom
m-ow:standardization-theorem

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@m-ow

@m-ow m-ow commented Jun 24, 2026

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This PR proves the standardization theorem: if M beta-reduces to N in any number of steps, then N is reachable from M by a standard reduction.

Builds on #671.

@lengyijun

lengyijun commented Jul 5, 2026

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Looking for your next pr !
I will start to prove "two variables are not enough" soon
This pr is very important for me

@chenson2018 chenson2018 self-assigned this Jul 5, 2026
@lengyijun

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Could you share your next PR related to "leftmost reduction"?
I would like to base the development of the Fokker Challenge on your code.

@m-ow

m-ow commented Jul 7, 2026

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Hi! @lengyijun My branch is still a bit too messy to share right now, but I expect to open the PR very soon.
Sorry for the wait, and thanks for bearing with me!

@m-ow m-ow force-pushed the standardization-theorem branch from 7f7a6cd to 93dfbbb Compare July 7, 2026 18:42
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3 participants