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Add inverse assoc law to Data.List.Relation.Ternary.Appending.Setoid.Properties #3002

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Merged
jamesmckinna merged 4 commits into from
Jun 28, 2026
Merged

Add inverse assoc law to Data.List.Relation.Ternary.Appending.Setoid.Properties #3002

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473797f
Add inverse assoc law to List Appending Setoid Properties
Taneb Jun 6, 2026
bb2e160
Merge remote-tracking branch 'origin/master' into appending-left-assoc
Taneb Jun 11, 2026
5dc7d06
Add changelog
Taneb Jun 11, 2026
5c2c125
Merge branch 'master' into appending-left-assoc
jamesmckinna Jun 28, 2026
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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -28,6 +28,11 @@ Non-backwards compatible changes
Minor improvements
------------------

* In `Data.List.Relation.Ternary.Appending.Setoid.Properties`:
```agda
assoc← : ∃[ ys ] Appending bs cs ys × Appending as ys ds → ∃[ xs ] Appending as bs xs × Appending xs cs ds
```

Deprecated modules
------------------

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5 changes: 5 additions & 0 deletions src/Data/List/Relation/Ternary/Appending/Setoid/Properties.agda
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Expand Up @@ -70,3 +70,8 @@ assoc→ :
∃[ xs ] Appending as bs xs × Appending xs cs ds →
∃[ ys ] Appending bs cs ys × Appending as ys ds
assoc→ = Appendingₚ.assoc→ ≈⇒≈;≈ id ≈;≈⇒≈

assoc← :
∃[ ys ] Appending bs cs ys × Appending as ys ds →
∃[ xs ] Appending as bs xs × Appending xs cs ds
assoc← = Appendingₚ.assoc← ≈;≈⇒≈ id ≈⇒≈;≈
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