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chore(Algebra/Homology/ShortComplex/SnakeLemma): remove an erw#38504

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chore(Algebra/Homology/ShortComplex/SnakeLemma): remove an erw#38504
yuanyi-350 wants to merge 1 commit intoleanprover-community:masterfrom
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  • rewrites L₀_g_δ to fold S.snd_δ into a single rw chain instead of using erw [S.L₀'_exact.g_desc]
  • rewrites δ_L₃_f as a simp proof over ← cancel_epi S.L₀'.g, δ, S.v₂₃.comm₁₂, and φ₂ instead of using erw [S.L₀'_exact.g_desc_assoc]

Extracted from #38415

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@yuanyi-350 yuanyi-350 added codex OpenAI Codex wrote (parts of) this PR. LLM-generated PRs with substantial input from LLMs - review accordingly labels Apr 25, 2026
@yuanyi-350 yuanyi-350 mentioned this pull request Apr 25, 2026
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PR summary 54b0ef5427

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference

Declarations diff

No declarations were harmed in the making of this PR! 🐙

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

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

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


Decrease in tech debt: (relative, absolute) = (2.00, 0.00)
Current number Change Type
624 -2 erw

Current commit 70eaae17ed
Reference commit 54b0ef5427

This script lives in the mathlib-ci repository. To run it locally, from your mathlib4 directory:

git clone https://github.com/leanprover-community/mathlib-ci.git ../mathlib-ci
../mathlib-ci/scripts/reporting/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).

@github-actions github-actions Bot added the t-algebra Algebra (groups, rings, fields, etc) label Apr 25, 2026
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Thanks!
maintainer merge

@grunweg grunweg added the tech debt Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip label Apr 25, 2026
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🚀 Pull request has been placed on the maintainer queue by grunweg.

@mathlib-triage mathlib-triage Bot added the maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. label Apr 25, 2026
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codex OpenAI Codex wrote (parts of) this PR. LLM-generated PRs with substantial input from LLMs - review accordingly maintainer-merge A reviewer has approved the changed; awaiting maintainer approval. t-algebra Algebra (groups, rings, fields, etc) tech debt Tracking cross-cutting technical debt, see e.g. the "Technical debt counters" stream on zulip

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2 participants