Theorem div12d

Description: A commutative/associative law for division. (Contributed by Mario Carneiro, 27-May-2016)

	Ref	Expression
Hypotheses	div1d.1	⊢ ( 𝜑 → 𝐴 ∈ ℂ )
	divcld.2	⊢ ( 𝜑 → 𝐵 ∈ ℂ )
	divmuld.3	⊢ ( 𝜑 → 𝐶 ∈ ℂ )
	divassd.4	⊢ ( 𝜑 → 𝐶 ≠ 0 )
Assertion	div12d	⊢ ( 𝜑 → ( 𝐴 · ( 𝐵 / 𝐶 ) ) = ( 𝐵 · ( 𝐴 / 𝐶 ) ) )

Proof

Step	Hyp	Ref	Expression
1		div1d.1	⊢ ( 𝜑 → 𝐴 ∈ ℂ )
2		divcld.2	⊢ ( 𝜑 → 𝐵 ∈ ℂ )
3		divmuld.3	⊢ ( 𝜑 → 𝐶 ∈ ℂ )
4		divassd.4	⊢ ( 𝜑 → 𝐶 ≠ 0 )
5		div12	⊢ ( ( 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ ( 𝐶 ∈ ℂ ∧ 𝐶 ≠ 0 ) ) → ( 𝐴 · ( 𝐵 / 𝐶 ) ) = ( 𝐵 · ( 𝐴 / 𝐶 ) ) )
6	1 2 3 4 5	syl112anc	⊢ ( 𝜑 → ( 𝐴 · ( 𝐵 / 𝐶 ) ) = ( 𝐵 · ( 𝐴 / 𝐶 ) ) )