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feat: make Quot live in Sort (max 1 u) rather than Sort u - #15023

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arthur-adjedj:fixQuot2
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feat: make Quot live in Sort (max 1 u) rather than Sort u#15023
arthur-adjedj wants to merge 2 commits into
leanprover:masterfrom
arthur-adjedj:fixQuot2

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This PR makes it so that quotients of propositions are not themselves propositions, fixing a transitivity issue with the definitional equality algorithm.

Related issue: #14977

@github-actions github-actions Bot added toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN mathlib4-nightly-available A branch for this PR exists at leanprover-community/mathlib4-nightly-testing:lean-pr-testing-NNNN labels Sep 4, 2026
@leanprover-bot leanprover-bot added the builds-manual CI has verified that the Lean Language Reference builds against this PR label Sep 4, 2026
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leanprover-bot commented Sep 4, 2026

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Reference manual CI status:

@mathlib-lean-pr-testing mathlib-lean-pr-testing Bot added the breaks-mathlib This is not necessarily a blocker for merging: but there needs to be a plan label Sep 4, 2026
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mathlib-lean-pr-testing Bot commented Sep 4, 2026

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Mathlib CI status (docs):

@mathlib-lean-pr-testing mathlib-lean-pr-testing Bot added builds-mathlib CI has verified that Mathlib builds against this PR and removed breaks-mathlib This is not necessarily a blocker for merging: but there needs to be a plan labels Sep 4, 2026
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