Theorem mul31d 11422

Description: Commutative/associative law. (Contributed by Mario Carneiro, 27-May-2016.)

Hypotheses

Ref	Expression
muld.1	⊢ (𝜑 → 𝐴 ∈ ℂ)
addcomd.2	⊢ (𝜑 → 𝐵 ∈ ℂ)
addcand.3	⊢ (𝜑 → 𝐶 ∈ ℂ)

Assertion

Ref	Expression
mul31d	⊢ (𝜑 → ((𝐴 · 𝐵) · 𝐶) = ((𝐶 · 𝐵) · 𝐴))

Proof of Theorem mul31d

Step	Hyp	Ref	Expression
1		muld.1	. 2 ⊢ (𝜑 → 𝐴 ∈ ℂ)
2		addcomd.2	. 2 ⊢ (𝜑 → 𝐵 ∈ ℂ)
3		addcand.3	. 2 ⊢ (𝜑 → 𝐶 ∈ ℂ)
4		mul31 11378	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = ((𝐶 · 𝐵) · 𝐴))
5	1, 2, 3, 4	syl3anc 1398	1 ⊢ (𝜑 → ((𝐴 · 𝐵) · 𝐶) = ((𝐶 · 𝐵) · 𝐴))

Syntax hints:   → wi 4   = wceq 1570   ∈ wcel 2143  (class class class)co 7412  ℂcc 11099   · cmul 11106

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-ext 2735  ax-mulcl 11163  ax-mulcom 11165  ax-mulass 11167

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-sb 2097  df-clab 2742  df-cleq 2755  df-clel 2838  df-rab 3417  df-v 3457  df-dif 3909  df-un 3911  df-ss 3923  df-nul 4288  df-if 4489  df-sn 4591  df-pr 4593  df-op 4597  df-uni 4874  df-br 5111  df-iota 6494  df-fv 6546  df-ov 7415

This theorem is referenced by:  lawcoslem1  26961