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[Merged by Bors] - chore(data/equiv/ring): make ring_aut reducible #2563

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[Merged by Bors] - chore(data/equiv/ring): make ring_aut reducible #2563

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2 changes: 1 addition & 1 deletion src/data/equiv/ring.lean
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Expand Up @@ -221,7 +221,7 @@ protected def integral_domain {A : Type*} (B : Type*) [ring A] [integral_domain
end ring_equiv

/-- The group of ring automorphisms. -/
def ring_aut (R : Type*) [has_mul R] [has_add R] := ring_equiv R R
@[reducible] def ring_aut (R : Type*) [has_mul R] [has_add R] := ring_equiv R R

namespace ring_aut

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