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feat: Rxx.nodup_toList lemmas and slice/foldl lemmas#12438

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feat: Rxx.nodup_toList lemmas and slice/foldl lemmas#12438
datokrat wants to merge 3 commits intomasterfrom
paul/humanevup6

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@datokrat
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This PR provides (1) lemmas showing that lists obtained from ranges have no duplicates and (2) lemmas about forIn and foldl on slices.

@datokrat datokrat added the changelog-library Library label Feb 11, 2026
@datokrat datokrat closed this Feb 12, 2026
@datokrat datokrat reopened this Feb 12, 2026
@github-actions github-actions bot added the toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN label Feb 12, 2026
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Mathlib CI status (docs):

  • ❗ Mathlib CI can not be attempted yet, as the nightly-testing-2026-02-12 tag does not exist there yet. We will retry when you push more commits. If you rebase your branch onto nightly-with-mathlib, Mathlib CI should run now. You can force Mathlib CI using the force-mathlib-ci label. (2026-02-12 12:13:54)

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Reference manual CI status:

  • ❗ Reference manual CI can not be attempted yet, as the nightly-testing-2026-02-12 tag does not exist there yet. We will retry when you push more commits. If you rebase your branch onto nightly-with-manual, reference manual CI should run now. You can force reference manual CI using the force-manual-ci label. (2026-02-12 12:13:55)

@datokrat datokrat marked this pull request as ready for review February 12, 2026 12:38
@datokrat datokrat requested a review from TwoFX as a code owner February 12, 2026 12:38
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