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[Merged by Bors] - feat(Set/Function): prove surjectivity from composition#20754

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b-mehta wants to merge 3 commits intomasterfrom
surj-on-of-comp
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[Merged by Bors] - feat(Set/Function): prove surjectivity from composition#20754
b-mehta wants to merge 3 commits intomasterfrom
surj-on-of-comp

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@b-mehta b-mehta commented Jan 14, 2025 •
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These lemmas were present for Function.Injective and Function.Surjective, but not for their partial versions.

Useful from the disproof of the Aharoni–Korman conjecture, #20082.

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@b-mehta b-mehta added the easy < 20s of review time. See the lifecycle page for guidelines. label Jan 14, 2025
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github-actions bot commented Jan 14, 2025

PR summary 0ec65b444b

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference

Declarations diff

+ InjOn.of_comp
+ SurjOn.of_comp

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.

No changes to technical debt.

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).

@github-actions github-actions bot added the t-data Data (lists, quotients, numbers, etc) label Jan 14, 2025
@b-mehta b-mehta requested a review from j-loreaux January 14, 2025 21:35
@b-mehta b-mehta mentioned this pull request Jan 14, 2025
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j-loreaux commented Jan 14, 2025

Thanks!

bors merge

@ghost ghost added the ready-to-merge This PR has been sent to bors. label Jan 14, 2025
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j-loreaux commented Jan 14, 2025

Thanks!

bors merge

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mathlib-bors bot commented Jan 14, 2025

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mathlib-bors bot pushed a commit that referenced this pull request Jan 14, 2025
@b-mehta
feat(Set/Function): prove surjectivity from composition (#20754)
881129a 
These lemmas were present for `Function.Injective` and `Function.Surjective`, but not for their partial versions.

Useful from the disproof of the Aharoni–Korman conjecture, #20082.
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mathlib-bors bot commented Jan 14, 2025

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(Set/Function): prove surjectivity from composition [Merged by Bors] - feat(Set/Function): prove surjectivity from composition Jan 14, 2025
@mathlib-bors mathlib-bors bot closed this Jan 14, 2025
@mathlib-bors mathlib-bors bot deleted the surj-on-of-comp branch January 14, 2025 23:28
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