[Merged by Bors] - feat: port Algebra.Group.WithOne.Basic #922
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j-loreaux
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SHAs shouldn't go in PR titles (ever?). Looking at this PR title and description I have no idea what it's about. |
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sorry, that was just a typo. VS Code auto-named the PR title and I forgot to change it. |
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bors merge |
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mathlib3 SHA: 4dc134b97a3de65ef2ed881f3513d56260971562
porting notes:
1. In `WithOne.lift` mathport's output was broken, but I think the only reason was that it was parenthesized wrong (or maybe it was a whitespace / formatting issue?)
2. In `MulEquiv.withOneCongr`, there were some `simp` calls that broke. I think this is a result of the way coercions are handled now. I think the net result is that `simp` doesn't get it into a form where it can apply `Equiv.symm_apply_apply`.
3. I added the `to_additive` attribute to `MulEquiv.withOneCongr_{refl, symm, trans}` because it just seemed to be missing from mathlib3.
4. `WithOne` already has semireducible transparency in mathlib4, so we are just ignoring the changing of transparency settings (this isn't even possible in Lean 4); see [Zulip](https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/local.20semireducible)
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Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status). Relates to the following PRs: * `algebra.group.ulift`: leanprover-community/mathlib4#906 * `algebra.group.with_one.basic`: leanprover-community/mathlib4#922 * `algebra.group_with_zero.units.lemmas`: leanprover-community/mathlib4#920 * `algebra.order.field.defs`: leanprover-community/mathlib4#905 * `algebra.order.group.abs`: leanprover-community/mathlib4#896 * `algebra.order.group.inj_surj`: leanprover-community/mathlib4#916 * `algebra.order.group.type_tags`: leanprover-community/mathlib4#921 * `algebra.order.monoid.with_top`: leanprover-community/mathlib4#902 * `algebra.order.positive.ring`: leanprover-community/mathlib4#911 * `algebra.order.ring.canonical`: leanprover-community/mathlib4#905 * `algebra.order.ring.char_zero`: leanprover-community/mathlib4#905 * `algebra.order.ring.defs`: leanprover-community/mathlib4#905 * `algebra.order.ring.inj_surj`: leanprover-community/mathlib4#917 * `algebra.ring.idempotents`: leanprover-community/mathlib4#918
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This is a proposed fix for the broken simp calls in #922. See https://leanprover.zulipchat.com/#narrow/stream/287929-mathlib4/topic/.60simp.60.20calls.20broken.20in.20mathlib4.23922/near/314783451 for more details. Note that `to_fun_as_coe` was a syntactic tautology when it was ported, but this is no longer the case because we now have `FunLike`.
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mathlib3 SHA: 4dc134b97a3de65ef2ed881f3513d56260971562
porting notes:
WithOne.liftmathport's output was broken, but I think the only reason was that it was parenthesized wrong (or maybe it was a whitespace / formatting issue?)MulEquiv.withOneCongr, there were somesimpcalls that broke. I think this is a result of the way coercions are handled now. I think the net result is thatsimpdoesn't get it into a form where it can applyEquiv.symm_apply_apply.to_additiveattribute toMulEquiv.withOneCongr_{refl, symm, trans}because it just seemed to be missing from mathlib3.WithOnealready has semireducible transparency in mathlib4, so we are just ignoring the changing of transparency settings (this isn't even possible in Lean 4); see Zulip