Theorem mulassd 7050

Description: Associative law for multiplication. (Contributed by Mario Carneiro, 27-May-2016.)

Hypotheses

Ref	Expression
addcld.1	⊢ (𝜑 → 𝐴 ∈ ℂ)
addcld.2	⊢ (𝜑 → 𝐵 ∈ ℂ)
addassd.3	⊢ (𝜑 → 𝐶 ∈ ℂ)

Assertion

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

Proof of Theorem mulassd

Step	Hyp	Ref	Expression
1		addcld.1	. 2 ⊢ (𝜑 → 𝐴 ∈ ℂ)
2		addcld.2	. 2 ⊢ (𝜑 → 𝐵 ∈ ℂ)
3		addassd.3	. 2 ⊢ (𝜑 → 𝐶 ∈ ℂ)
4		mulass 7012	. 2 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶)))
5	1, 2, 3, 4	syl3anc 1135	1 ⊢ (𝜑 → ((𝐴 · 𝐵) · 𝐶) = (𝐴 · (𝐵 · 𝐶)))

Syntax hints:   → wi 4   = wceq 1243   ∈ wcel 1393  (class class class)co 5512  ℂcc 6887   · cmul 6894

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-mulass 6987

This theorem depends on definitions:  df-bi 110  df-3an 887

This theorem is referenced by:  ltmul1  7583  recexap  7634  mulap0  7635  mulcanapd  7642  receuap  7650  divdivdivap  7689  divmuleqap  7693  conjmulap  7705  apmul1  7764  qapne  8574  expadd  9297  binom3  9366  crre  9457  remullem  9471  resqrexlemcalc1  9612  resqrexlemnm  9616  amgm2  9714