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feat(Algebra/Category/ModuleCat): a functorial projective resolution#22556

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joelriou wants to merge 10 commits intomasterfrom
jriou-left-resolution-modulecat
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feat(Algebra/Category/ModuleCat): a functorial projective resolution#22556
joelriou wants to merge 10 commits intomasterfrom
jriou-left-resolution-modulecat

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@joelriou joelriou commented Mar 4, 2025

@joelriou joelriou added the t-category-theory Category theory label Mar 4, 2025
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github-actions bot commented Mar 4, 2025

PR summary e580fe3626

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference
Mathlib.Algebra.Homology.LeftResolutions.Basic (new file) 1022
Mathlib.Algebra.Category.ModuleCat.LeftResolutions (new file) 1301

Declarations diff

+ LeftResolutions
+ chainComplex
+ chainComplexFunctor
+ chainComplexMap
+ chainComplexMap_comp
+ chainComplexMap_f_0
+ chainComplexMap_f_1
+ chainComplexMap_f_succ_succ
+ chainComplexMap_id
+ chainComplexMap_zero
+ chainComplexXIso
+ chainComplexXOneIso
+ chainComplexXZeroIso
+ cokernel.map_id
+ cokernel.map_zero
+ exactAt_map_chainComplex_succ
+ instance (X : Type u) : Projective ((free R).obj X)
+ kernel.map_id
+ kernel.map_zero
+ map_chainComplex_d
+ map_chainComplex_d_1_0
+ mk'XIso
+ mk'_congr_succ'_d
+ mk'_d
+ mkAux_eq_shortComplex_mk_d_comp_d
+ mkXIso
+ mk_congr_succ_X₃
+ mk_congr_succ_d₂
+ mk_d
+ projectiveResolutions
+ π_naturality
- mk'_X_succ
- mk'_d_succ

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 script/declarations_diff.sh contains some details about this script.


Decrease in tech debt: (relative, absolute) = (1.00, 0.00)
Current number Change Type
1572 -1 porting notes

Current commit e580fe3626
Reference commit 04fc112dc6

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).

@mathlib4-dependent-issues-bot mathlib4-dependent-issues-bot added the blocked-by-other-PR This PR depends on another PR (this label is automatically managed by a bot) label Mar 4, 2025
@mathlib4-dependent-issues-bot mathlib4-dependent-issues-bot removed the blocked-by-other-PR This PR depends on another PR (this label is automatically managed by a bot) label Oct 22, 2025
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This PR/issue depends on:

@joelriou
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This PR has been migrated to a fork-based workflow: #30798

@joelriou joelriou closed this Oct 22, 2025
@YaelDillies YaelDillies deleted the jriou-left-resolution-modulecat branch November 6, 2025 09:18
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