Metamath Proof Explorer


Theorem mulmoddvds

Description: If an integer is divisible by a positive integer, the product of this integer with another integer modulo the positive integer is 0. (Contributed by Alexander van der Vekens, 30-Aug-2018) (Proof shortened by AV, 18-Mar-2022)

Ref Expression
Assertion mulmoddvds ( ( 𝑁 ∈ ℕ ∧ 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ) → ( 𝑁 ∥ 𝐴 → ( ( 𝐴 · 𝐵 ) mod 𝑁 ) = 0 ) )

Proof

Step Hyp Ref Expression
1 simp1 ⊢ ( ( 𝑁 ∈ ℕ ∧ 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ) → 𝑁 ∈ ℕ )
2 nnz ⊢ ( 𝑁 ∈ ℕ → 𝑁 ∈ ℤ )
3 dvdsmultr1 ⊢ ( ( 𝑁 ∈ ℤ ∧ 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ) → ( 𝑁 ∥ 𝐴 → 𝑁 ∥ ( 𝐴 · 𝐵 ) ) )
4 2 3 syl3an1 ⊢ ( ( 𝑁 ∈ ℕ ∧ 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ) → ( 𝑁 ∥ 𝐴 → 𝑁 ∥ ( 𝐴 · 𝐵 ) ) )
5 dvdsmod0 ⊢ ( ( 𝑁 ∈ ℕ ∧ 𝑁 ∥ ( 𝐴 · 𝐵 ) ) → ( ( 𝐴 · 𝐵 ) mod 𝑁 ) = 0 )
6 1 4 5 syl6an ⊢ ( ( 𝑁 ∈ ℕ ∧ 𝐴 ∈ ℤ ∧ 𝐵 ∈ ℤ ) → ( 𝑁 ∥ 𝐴 → ( ( 𝐴 · 𝐵 ) mod 𝑁 ) = 0 ) )