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[Merged by Bors] - feat(CategoryTheory/Triangulated/TStructure): more on truncLT and truncGE#35362

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[Merged by Bors] - feat(CategoryTheory/Triangulated/TStructure): more on truncLT and truncGE#35362
joelriou wants to merge 15 commits intoleanprover-community:masterfrom
joelriou:spectral-sequences-1-trunc-ltge-1

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@joelriou joelriou added WIP Work in progress t-category-theory Category theory labels Feb 15, 2026
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github-actions bot commented Feb 15, 2026

PR summary a237616fe5

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference

Declarations diff

+ from_truncGE_obj_ext
+ instance (X : C) (n : ℤ) : t.IsGE ((t.truncGE n).obj X) n
+ instance (X : C) (n : ℤ) : t.IsLE ((t.truncLT (n + 1)).obj X) n
+ instance (X : C) (n : ℤ) : t.IsLE ((t.truncLT n).obj X) (n - 1)
+ instance (X : C) (n : ℤ) [t.IsGE X n] : IsIso ((t.truncGEπ n).app X) := by
+ instance (n : ℤ) : t.IsGE (0 : C) n := t.isGE_of_isZero (isZero_zero C) n
+ instance (n : ℤ) : t.IsLE (0 : C) n := t.isLE_of_isZero (isZero_zero C) n
+ isGE_iff_isIso_truncGEπ_app
+ isGE_iff_isZero_truncLT_obj
+ isGE_of_isZero
+ isGE_truncGE_obj
+ isLE_iff_isIso_truncLTι_app
+ isLE_iff_isZero_truncGE_obj
+ isLE_of_isZero
+ isLE_truncLT_obj
+ isZero_truncGE_obj_of_isLE
+ isZero_truncLT_obj_of_isGE
+ liftTruncLT
+ liftTruncLT_aux
+ liftTruncLT_ι
+ natTransTriangleLTGEOfLE
+ natTransTriangleLTGEOfLE_refl
+ natTransTriangleLTGEOfLE_trans
+ natTransTruncGEOfLE
+ natTransTruncGEOfLE_refl
+ natTransTruncGEOfLE_refl_app
+ natTransTruncGEOfLE_trans
+ natTransTruncGEOfLE_trans_app
+ natTransTruncLTOfLE
+ natTransTruncLTOfLE_refl
+ natTransTruncLTOfLE_refl_app
+ natTransTruncLTOfLE_trans
+ natTransTruncLTOfLE_trans_app
+ natTransTruncLTOfLE_ι
+ natTransTruncLTOfLE_ι_app
+ to_truncLT_obj_ext
+ triangleFunctorNatTransOfLE
+ triangleFunctorNatTransOfLE_app_hom₂
+ triangleFunctorNatTransOfLE_refl
+ triangleFunctorNatTransOfLE_trans
+ triangleMapOfLE
+ truncGE_map_truncGEπ_app
+ truncGEδLT_comp_natTransTruncLTOfLE_app
+ truncGEδLT_comp_truncLTι
+ truncGEδLT_comp_truncLTι_app
+ truncGEδLT_comp_whiskerRight_natTransTruncLTOfLE
+ truncGEπ_comp_truncGEδLT
+ truncGEπ_comp_truncGEδLT_app
+ truncGEπ_naturality
+ truncLT_map_truncLTι_app
+ truncLTι_comp_truncGEπ
+ truncLTι_comp_truncGEπ_app
+ π_natTransTruncGEOfLE
+ π_natTransTruncGEOfLE_app
- instance (X : C) (n : ℤ) : t.IsGE ((t.truncGE n).obj X) n := by
- instance (X : C) (n : ℤ) : t.IsLE ((t.truncLT n).obj X) (n - 1) := by

You can run this locally as follows
## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for scripts/declarations_diff.sh contains some details about this script.


Decrease in tech debt: (relative, absolute) = (3.00, 0.00)
Current number Change Type
11075 -3 backward.isDefEq

Current commit 1078957611
Reference commit a237616fe5

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary
  • The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
  • The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

@joelriou joelriou removed the WIP Work in progress label Feb 18, 2026
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Thanks!

maintainer merge

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🚀 Pull request has been placed on the maintainer queue by dagurtomas.

@mathlib-triage mathlib-triage bot added the maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. label Feb 26, 2026
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Thanks!

bors d+

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mathlib-bors bot commented Mar 2, 2026

✌️ joelriou can now approve this pull request. To approve and merge a pull request, simply reply with bors r+. More detailed instructions are available here.

@mathlib-triage mathlib-triage bot added delegated This pull request has been delegated to the PR author (or occasionally another non-maintainer). and removed maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. labels Mar 2, 2026
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joelriou commented Mar 2, 2026

Thanks!

bors merge

@mathlib-triage mathlib-triage bot added the ready-to-merge This PR has been sent to bors. label Mar 2, 2026
mathlib-bors bot pushed a commit that referenced this pull request Mar 2, 2026
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mathlib-bors bot commented Mar 2, 2026

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(CategoryTheory/Triangulated/TStructure): more on truncLT and truncGE [Merged by Bors] - feat(CategoryTheory/Triangulated/TStructure): more on truncLT and truncGE Mar 2, 2026
@mathlib-bors mathlib-bors bot closed this Mar 2, 2026
pfaffelh pushed a commit to pfaffelh/mathlib4 that referenced this pull request Mar 2, 2026
xroblot pushed a commit to xroblot/mathlib4 that referenced this pull request Mar 10, 2026
pevogam pushed a commit to pevogam/mathlib4 that referenced this pull request Mar 19, 2026
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