Sync upstream mathlib4 (2026-07-31, +8 commits) - #90
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Co-authored-by: Batixx <s59fpern@uni-bonn.de>
Change `/- ` to `/-- ` when it is arguably meant to be. In a few cases, it wasn't 100% clear to me which is preferable. This was just done with regex search, so probably not exhaustive. Co-authored-by: Batixx <s59fpern@uni-bonn.de>
Partially enabled through #35683.
…n form and pivots of matrices (#42236) We add definitions for the row echelon form and pivots of matrices. We also add some more API about matrix ranks and add abbreviations for upper/lower-triangular matrices based on the current block triangular definition. Co-authored-by: raoxiaojia <raoxiaojia@gmail.com>
… command (#42274) This PR deprecates the global `#count_heartbeats` command. (Not to be confused with `#count_heartbeats in`, which we want to keep). The reason is that `#count_heartbeats` doesn't work in its current implementation. A useful alternative is to use `set_option trace.profiler true` with `set_option trace.profiler.useHeartbeats` true. As discussed in https://leanprover.zulipchat.com/#narrow/channel/263328-triage/topic/issue.20.214.2323905.3A.20linter.2EcountHeartbeats.20is.20broken/with/538006069
* Mostly useful for `ℕ` * I added the `Finset.Iic` lemmas by symmetry, but I'm happy to remove them if we think they are redundant.
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Automated daily sync from
leanprover-community/mathlib4@master.f60ac0eb466a8db04f36381155dd58b1a213374eAuto-merges to
masteronceCI (self-hosted)passes. Regenerateddaily until merged or until a conflict appears.
Note
Low Risk
Routine upstream merge: mostly additive definitions, deprecated aliases, and proof refactors with limited behavioral change outside linear algebra API renames.
Overview
Upstream mathlib sync adding row echelon / pivot theory (
Matrix.IsRowEchelon,IsReducedRowEchelon,IsPivotedBywithrank_eqand uniqueness), wired intoMathlib.lean.Matrix triangular API is renamed for clarity:
IsUpperTriangular/IsLowerTriangularabbreviateBlockTriangular, anddet_of_isUpperTriangular/charpoly_of_isUpperTriangularreplace the old*_upperTriangularnames (deprecated aliases kept). Call sites (Gram–Schmidt, charpoly, determinant docs) follow the new names.Rank and determinant gain non-zero-divisor / injectivity-based lemmas (
rank_of_det_mem_nonZeroDivisors,rank_mul_eq_*,mulVec_injective_of_det_*,rank_le_card_of_support_subset);range_lt_top_of_det_eq_zerois generalized beyond fields to[IsDomain R] [Free R M].Smaller churn: new Finset product identities on
Iio/IicforLocallyFiniteOrderBot; widespreadfun_prop/ measurability proof simplifications; doc and@[to_additive]comment fixes;=ᵐ[μ]instead of=ᶠ[ae μ]in a few measure-theory spots;#count_heartbeatslinter deprecated in favor of#count_heartbeats in/ profiler options.Reviewed by Cursor Bugbot for commit d8e37ce. Bugbot is set up for automated code reviews on this repo. Configure here.