feat(algebra/big_operators): dvd_sum #1679
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jcommelin
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Nov 13, 2019
| @@ -1526,6 +1526,14 @@ by rw [h, prod_append, prod_cons, mul_left_comm]; exact dvd_mul_right _ _ | |||
| @[simp] theorem sum_const_nat (m n : ℕ) : sum (list.repeat m n) = m * n := | |||
| by induction n; [refl, simp only [*, repeat_succ, sum_cons, nat.mul_succ, add_comm]] | |||
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| theorem dvd_sum [comm_semiring α] {a} {l : list α} (h : ∀ x ∈ l, a ∣ x) : a ∣ l.sum := | |||
| begin | |||
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I would have expected a term-mode pattern matching proof from Chris... I'm happy to see you are coming over to the light side of the force. [/joking]
robertylewis
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Nov 13, 2019
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anrddh
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May 15, 2020
* feat(data/multiset): dvd_sum * feat(algebra/big_operators): dvd_sum * fix build * fix build * fix build
anrddh
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May 16, 2020
* feat(data/multiset): dvd_sum * feat(algebra/big_operators): dvd_sum * fix build * fix build * fix build
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