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[Merged by Bors] - feat: allow grind to unfold abs #31935

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[Merged by Bors] - feat: allow grind to unfold abs #31935

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bcb2857
feat: allow grind to unfold abs
kim-em Nov 22, 2025
53e1aa2
feat: allow grind to unfold abs
kim-em Nov 22, 2025
4da9018
another test
kim-em Nov 22, 2025
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2 changes: 1 addition & 1 deletion Mathlib/Algebra/Order/Group/Unbundled/Abs.lean
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Expand Up @@ -34,7 +34,7 @@ section Group
variable [Group α] {a b : α}

/-- `mabs a`, denoted `|a|ₘ`, is the absolute value of `a`. -/
@[to_additive /-- `abs a`, denoted `|a|`, is the absolute value of `a` -/]
@[to_additive (attr := grind) /-- `abs a`, denoted `|a|`, is the absolute value of `a` -/]
def mabs (a : α) : α := a ⊔ a⁻¹

@[inherit_doc mabs]
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8 changes: 8 additions & 0 deletions MathlibTest/grind/linarith.lean
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@@ -0,0 +1,8 @@
import Mathlib

example {α : Type*} [LinearOrder α] [CommRing α] [IsStrictOrderedRing α]
(a b c d : α) : |a - b| ≤ |a - c| + |c - d| + |b - d| := by
grind

example (L : ℝ) : 0 < 1 + |L| := by
grind