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[Merged by Bors] - docs(data/nat/choose/sum): binomial theorem is for commuting elements #18071

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[Merged by Bors] - docs(data/nat/choose/sum): binomial theorem is for commuting elements #18071

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2 changes: 1 addition & 1 deletion src/data/nat/choose/sum.lean
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Expand Up @@ -31,7 +31,7 @@ variables [semiring R] {x y : R} (h : commute x y) (n : ℕ)

include h

/-- A version of the **binomial theorem** for noncommutative semirings. -/
/-- A version of the **binomial theorem** for commuting elements in noncommutative semirings. -/
theorem add_pow :
(x + y) ^ n = ∑ m in range (n + 1), x ^ m * y ^ (n - m) * choose n m :=
begin
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