Theorem mulne0

Description: The product of two nonzero numbers is nonzero. (Contributed by NM, 30-Dec-2007)

	Ref	Expression
Assertion	mulne0	⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝐴 ≠ 0 ) ∧ ( 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ) ) → ( 𝐴 · 𝐵 ) ≠ 0 )

Proof

Step	Hyp	Ref	Expression
1		mulne0b	⊢ ( ( 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ) → ( ( 𝐴 ≠ 0 ∧ 𝐵 ≠ 0 ) ↔ ( 𝐴 · 𝐵 ) ≠ 0 ) )
2	1	biimpa	⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ) ∧ ( 𝐴 ≠ 0 ∧ 𝐵 ≠ 0 ) ) → ( 𝐴 · 𝐵 ) ≠ 0 )
3	2	an4s	⊢ ( ( ( 𝐴 ∈ ℂ ∧ 𝐴 ≠ 0 ) ∧ ( 𝐵 ∈ ℂ ∧ 𝐵 ≠ 0 ) ) → ( 𝐴 · 𝐵 ) ≠ 0 )