Theorem div23i

Description: A commutative/associative law for division. (Contributed by NM, 3-Sep-1999)

	Ref	Expression
Hypotheses	divclz.1	⊢ 𝐴 ∈ ℂ
	divclz.2	⊢ 𝐵 ∈ ℂ
	divmulz.3	⊢ 𝐶 ∈ ℂ
	divass.4	⊢ 𝐶 ≠ 0
Assertion	div23i	⊢ ( ( 𝐴 · 𝐵 ) / 𝐶 ) = ( ( 𝐴 / 𝐶 ) · 𝐵 )

Proof

Step	Hyp	Ref	Expression
1		divclz.1	⊢ 𝐴 ∈ ℂ
2		divclz.2	⊢ 𝐵 ∈ ℂ
3		divmulz.3	⊢ 𝐶 ∈ ℂ
4		divass.4	⊢ 𝐶 ≠ 0
5	3 4	pm3.2i	⊢ ( 𝐶 ∈ ℂ ∧ 𝐶 ≠ 0 )
6		div23	⊢ ( ( 𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ ( 𝐶 ∈ ℂ ∧ 𝐶 ≠ 0 ) ) → ( ( 𝐴 · 𝐵 ) / 𝐶 ) = ( ( 𝐴 / 𝐶 ) · 𝐵 ) )
7	1 2 5 6	mp3an	⊢ ( ( 𝐴 · 𝐵 ) / 𝐶 ) = ( ( 𝐴 / 𝐶 ) · 𝐵 )