Sync upstream mathlib4 (2026-07-26, +4 commits) - #85
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…(#29077) Prove that the inclusion of an interval into the real numbers is a smooth embedding, and use this to golf the proof that this inclusion is smooth. While at it, rename the smoothness lemmas after the coercion `Subtype.val` they are using, as mandated by the naming convention.
…ial_le (#41577) This PR adds the `@[gcongr]` attribute to `Nat.ascFactorial_le` and to the identically-shaped `Nat.descFactorial_le`, so that `gcongr` can rewrite under `ascFactorial`/`descFactorial`. `Nat.factorial_le` in the same file is already tagged `@[mono, gcongr]`. Follow-up to [#40816 (feat(Data/Nat/Factorial/Basic): add `ascFactorial_le`)](leanprover-community/mathlib4#40816). 🤖 Prepared with Claude Code
This PR updates the Mathlib dependencies.
This PR updates the Mathlib dependencies.
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Automated daily sync from
leanprover-community/mathlib4@master.9cebae57f419f984d008f357605b2621a1d9f13bAuto-merges to
masteronceCI (self-hosted)passes. Regenerateddaily until merged or until a conflict appears.
Note
Low Risk
Routine upstream merge touching Mathlib proofs and a dependency pin; no auth, security, or application runtime code.
Overview
Upstream mathlib4 sync (tip
9cebae57…) bumps batteries and advancesupstream_sha.Nat factorials:
ascFactorial_leanddescFactorial_leare tagged with@[gcongr]so the monotonicity tactic can use them when rewriting under ascending/descending factorials.Manifold
Iccintervals: The proof thatIcc x y → ℝis smooth is reworked usingSmoothEmbedding/IsImmersionOfComplementinstead of a long chart-by-chart argument. New results includeisSmoothEmbedding_subtypeVal_Icc,contMDiff_iff_comp_subtypeVal_Icc, andisImmersionOfComplement_subtypeVal_Icc. Public names move fromcontMDiff_subtype_coe_Icc/mfderiv_subtype_coe_Icc_onetocontMDiff_subtypeVal_Icc/mfderiv_subtypeVal_Icc_one(old names kept as deprecated aliases).Mathlib/Geometry/Manifold/Instances/Real.leangains simp-friendly lemmas for𝓡∂ n,IccLeftChart, andIccRightChart(apply/symm forms) to support the new proofs.Reviewed by Cursor Bugbot for commit 1789ffe. Bugbot is set up for automated code reviews on this repo. Configure here.