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[Merged by Bors] - feat(GroupTheory/Index): index_eq_zero_iff_infinite #15504

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@jsm28 jsm28 commented Aug 5, 2024

Add the trivial, but apparently missing, lemma:

@[to_additive]
lemma index_eq_zero_iff_infinite : H.index = 0 ↔ Infinite (G ⧸ H) := by

From AperiodicMonotilesLean.


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@jsm28 jsm28 added easy < 20s of review time. See the lifecycle page for guidelines. t-algebra Algebra (groups, rings, fields, etc) labels Aug 5, 2024
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github-actions bot commented Aug 5, 2024

PR summary 8abcb1d55e

Import changes for modified files

No significant changes to the import graph

Import changes for all files
Files Import difference

Declarations diff

+ index_eq_zero_iff_infinite

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.

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urkud commented Aug 6, 2024

Thanks! 🎉
bors merge

@github-actions github-actions bot added the ready-to-merge This PR has been sent to bors. label Aug 6, 2024
mathlib-bors bot pushed a commit that referenced this pull request Aug 6, 2024
Add the trivial, but apparently missing, lemma:

```lean
@[to_additive]
lemma index_eq_zero_iff_infinite : H.index = 0 ↔ Infinite (G ⧸ H) := by
```

From AperiodicMonotilesLean.
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mathlib-bors bot commented Aug 6, 2024

Pull request successfully merged into master.

Build succeeded:

@mathlib-bors mathlib-bors bot changed the title feat(GroupTheory/Index): index_eq_zero_iff_infinite [Merged by Bors] - feat(GroupTheory/Index): index_eq_zero_iff_infinite Aug 6, 2024
@mathlib-bors mathlib-bors bot closed this Aug 6, 2024
@mathlib-bors mathlib-bors bot deleted the jsm28/index_eq_zero_iff_infinite branch August 6, 2024 23:04
bjoernkjoshanssen pushed a commit that referenced this pull request Sep 9, 2024
Add the trivial, but apparently missing, lemma:

```lean
@[to_additive]
lemma index_eq_zero_iff_infinite : H.index = 0 ↔ Infinite (G ⧸ H) := by
```

From AperiodicMonotilesLean.
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