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[Merged by Bors] - chore: Move x ⊔ y = (x + y + |y - x|) / 2#9466

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[Merged by Bors] - chore: Move x ⊔ y = (x + y + |y - x|) / 2#9466
YaelDillies wants to merge 5 commits intomasterfrom
move_inf_eq_half

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Part of #9411


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@YaelDillies YaelDillies added awaiting-review t-algebra Algebra (groups, rings, fields, etc) t-order Order theory labels Jan 5, 2024
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Thanks 🎉

bors merge

@ghost ghost added ready-to-merge This PR has been sent to bors. and removed awaiting-review labels Jan 8, 2024
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mathlib-bors bot commented Jan 8, 2024

Merge conflict.

@ghost ghost added the merge-conflict The PR has a merge conflict with master, and needs manual merging. (this label is managed by a bot) label Jan 8, 2024
@ghost ghost removed the merge-conflict The PR has a merge conflict with master, and needs manual merging. (this label is managed by a bot) label Jan 8, 2024
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bors r+

mathlib-bors bot pushed a commit that referenced this pull request Jan 9, 2024
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mathlib-bors bot commented Jan 9, 2024

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title chore: Move x ⊔ y = (x + y + |y - x|) / 2 [Merged by Bors] - chore: Move x ⊔ y = (x + y + |y - x|) / 2 Jan 9, 2024
@mathlib-bors mathlib-bors bot closed this Jan 9, 2024
@mathlib-bors mathlib-bors bot deleted the move_inf_eq_half branch January 9, 2024 18:26
mathlib-bors bot pushed a commit that referenced this pull request Jan 30, 2024
`Algebra.GroupPower.Lemmas` used to be a big bag of lemmas that made it there on the criterion that they needed "more imports". This was completely untrue, as all lemmas could be moved to earlier files in PRs:
- #9440
- #9442
- #9443
- #9455
- #9456
- #9457
- #9459
- #9461
- #9463
- #9466
- #9501
- #9502
- #9503
- #9505
- #9551
- #9553
- #9720
- #9739
- #9740
- #9805
- #9806
- and this one

There are several reasons for this:
* Necessary lemmas have been moved to earlier files since lemmas were dumped in `Algebra.GroupPower.Lemmas`
* In the Lean 3 → Lean 4 transition, Std acquired basic `Int` and `Nat` lemmas which let us shortcircuit the part of the algebraic order hierarchy on which the corresponding general lemmas rest
* Some proofs were overpowered
* Some earlier files were tangled and I have untangled them

This PR finishes the job by moving the last few lemmas out of `Algebra.GroupPower.Lemmas`, which is therefore deleted.
mathlib-bors bot pushed a commit that referenced this pull request Jan 30, 2024
`Algebra.GroupPower.Lemmas` used to be a big bag of lemmas that made it there on the criterion that they needed "more imports". This was completely untrue, as all lemmas could be moved to earlier files in PRs:
- #9440
- #9442
- #9443
- #9455
- #9456
- #9457
- #9459
- #9461
- #9463
- #9466
- #9501
- #9502
- #9503
- #9505
- #9551
- #9553
- #9720
- #9739
- #9740
- #9805
- #9806
- and this one

There are several reasons for this:
* Necessary lemmas have been moved to earlier files since lemmas were dumped in `Algebra.GroupPower.Lemmas`
* In the Lean 3 → Lean 4 transition, Std acquired basic `Int` and `Nat` lemmas which let us shortcircuit the part of the algebraic order hierarchy on which the corresponding general lemmas rest
* Some proofs were overpowered
* Some earlier files were tangled and I have untangled them

This PR finishes the job by moving the last few lemmas out of `Algebra.GroupPower.Lemmas`, which is therefore deleted.
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