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Theorem mul31d 11525
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
StepHypRef Expression
1 muld.1 . 2 (𝜑 → 𝐴 ∈ ℂ)
2 addcomd.2 . 2 (𝜑 → 𝐵 ∈ ℂ)
3 addcand.3 . 2 (𝜑 → 𝐶 ∈ ℂ)
4 mul31 11481 . 2 ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → ((𝐴 · 𝐵) · 𝐶) = ((𝐶 · 𝐵) · 𝐴))
51, 2, 3, 4syl3anc 1398 1 (𝜑 → ((𝐴 · 𝐵) · 𝐶) = ((𝐶 · 𝐵) · 𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569   ∈ wcel 2144  (class class class)co 7421  ℂcc 11202   · cmul 11209
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-mulcl 11266  ax-mulcom 11268  ax-mulass 11270
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-br 5103  df-iota 6494  df-fv 6547  df-ov 7424
This theorem is used by:  lawcoslem1  27149
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