Sync upstream mathlib4 (2026-08-02, +12 commits) - #92
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This PR updates the Mathlib dependencies.
…1488) Split from #37959 Co-authored-by: artie2000 <artem.khovanov@gmail.com>
…three property (#42321)
… and double sum indexed by ι₂ and fibres of f : ι₁ → ι₂ (#39607) 1. Add variant `equivCongrLeft'` of `equivCongrLeft`, and corresponding `…_apply` lemma. 2. Add `…_of lemmas` for both `equivCongrLeft` and `equivCongrLeft'`. 3. Add `…of lemma` for `sigmaCurry`, i.e. `sigmaCurry_of`. 4. Add `sigmaFiberAddEquiv`: the equivalence between a direct sum indexed by a type `ι₁` and the double sum indexed by a type `ι₂` and the fibres of a map `f : ι₁ → ι₂`. Add two `…_apply` lemmas and an `…_of` lemma. Co-authored-by: TentativeConvert <marcus.zibrowius@cantab.net>
All these definitions are noncomputable (because they use choice/produce sets), but the computability checker doesn't spot this until I try making `Set` a one-field structure. This is because the computability checker doesn't even try to compute sorts, but it doesn't see that `s : Set α` is (equivalent to) a family of sorts. Follow-up to #41446. Generated by Claude Opus, then reviewed and cherry-picked line-by-line by myself. Assisted-by: Claude Opus 4.8
This PR probably removes most existing typos in mathlib docstrings. They were found by first extracting docstrings and putting them in a seperate txt file, then run a spell checker on in (in this case: https://github.com/codespell-project/codespell) and finally checking the output (many false ositives from names...) Co-authored-by: Batixx <s59fpern@uni-bonn.de>
…ty (#41798) Prove `Measure.map (AffineMap.homothety x c) μH[d] = ‖c‖₊⁻¹ ^ d • μH[d]` for `c ≠ 0`, resolving the TODO in `Mathlib/MeasureTheory/Measure/Hausdorff.lean`: the generalisation of `AffineMap.homothety_continuous` it was waiting for has since been merged, so the result follows from `hausdorffMeasure_homothety_preimage` via `Measure.ext`.
…ile (#42335) Co-authored-by: Whysoseriourhah <yx3021@ic.ac.uk>
Also tags `Subgraph.Adj.adj_sub`/`spanningCoe_adj`/`sup_adj`/`edge_adj` with `grind`.
This PR updates the Mathlib dependencies.
If the category of elements of a covariant functor has an initial object, then the functor is corepresentable. Co-authored-by: emilyriehl <eriehl@jhu.edu>
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Automated daily sync from
leanprover-community/mathlib4@master.ae0d973d69b779efa724095bd41793b8cf233831Auto-merges to
masteronceCI (self-hosted)passes. Regenerateddaily until merged or until a conflict appears.
Note
Low Risk
Routine mathlib4 upstream sync: mostly additive lemmas, proof refactors, and documentation. No auth, deployment, or breaking application-layer changes in this repo’s sync workflow.
Overview
Daily upstream merge from
leanprover-community/mathlib4(tipae0d973).New API:
DirectSum.sigmaFiberAddEquivand relatedsigmaCurry/equivCongrLeftsimp lemmas;Module.finrank_dvd_finrank_left/rightand division cancel lemmas (used in intermediate fields);Functor.ElementsequivalenceshasInitial_iff_isCorepresentable/hasInitial_iff_isRepresentable;HomotopyEquiv.copyandhomotopyEquivalencesinstances (IsMultiplicative, two-out-of-three,RespectsIso);Measure.map_homothety_hausdorffMeasure; normed star group lemmas (Metric.star_ball,dist_star_star, etc.).Proof / definitional cleanup: valuation
restrictandIsEquivAPI; homotopy equivalence API (@[simps], implicitCinrefl/symm/trans); simple-graphedge/sup_adjproofs viagrind; intermediate fieldfinrank_dvdrouted through new module lemmas.Misc:
noncomputableon several archive/counterexample defs; doc/typo fixes across tactics and ring theory;lake-manifestBatteries revision bump.Reviewed by Cursor Bugbot for commit add1aba. Bugbot is set up for automated code reviews on this repo. Configure here.