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[Merged by Bors] - chore: fix implicit-reducible diamond in DegLex #38304

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[Merged by Bors] - chore: fix implicit-reducible diamond in DegLex #38304

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4 changes: 1 addition & 3 deletions Mathlib/Data/Finsupp/MonomialOrder/DegLex.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -127,11 +127,10 @@ instance isStrictOrder : IsStrictOrder (DegLex (α →₀ ℕ)) (· < ·) where

/-- The linear order on `Finsupp`s obtained by the homogeneous lexicographic ordering. -/
noncomputable instance : LinearOrder (DegLex (α →₀ ℕ)) :=
LinearOrder.lift'
fast_instance% LinearOrder.lift'
(fun (f : DegLex (α →₀ ℕ)) ↦ toLex ((ofDegLex f).degree, toLex (ofDegLex f)))
(fun f g ↦ by simp)

set_option backward.isDefEq.respectTransparency false in
theorem le_iff {x y : DegLex (α →₀ ℕ)} :
x ≤ y ↔ (ofDegLex x).degree < (ofDegLex y).degree ∨
(ofDegLex x).degree = (ofDegLex y).degree ∧ toLex (ofDegLex x) ≤ toLex (ofDegLex y) := by
Expand All @@ -151,7 +150,6 @@ instance : IsOrderedCancelAddMonoid (DegLex (α →₀ ℕ)) where
rw [le_iff] at h ⊢
simpa [ofDegLex_add, map_add] using h

set_option backward.isDefEq.respectTransparency false in
theorem single_strictAnti : StrictAnti (fun (a : α) ↦ toDegLex (single a 1)) := by
intro _ _ h
simp only [lt_iff, ofDegLex_toDegLex, degree_single, lt_self_iff_false, Lex.single_lt_iff, h,
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