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Theorem mul12d 8178
Description: Commutative/associative law that swaps the first two factors in a triple product. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
muld.1 (𝜑𝐴 ∈ ℂ)
addcomd.2 (𝜑𝐵 ∈ ℂ)
mul12d.3 (𝜑𝐶 ∈ ℂ)
Assertion
Ref Expression
mul12d (𝜑 → (𝐴 · (𝐵 · 𝐶)) = (𝐵 · (𝐴 · 𝐶)))

Proof of Theorem mul12d
StepHypRef Expression
1 muld.1 . 2 (𝜑𝐴 ∈ ℂ)
2 addcomd.2 . 2 (𝜑𝐵 ∈ ℂ)
3 mul12d.3 . 2 (𝜑𝐶 ∈ ℂ)
4 mul12 8155 . 2 ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ ∧ 𝐶 ∈ ℂ) → (𝐴 · (𝐵 · 𝐶)) = (𝐵 · (𝐴 · 𝐶)))
51, 2, 3, 4syl3anc 1249 1 (𝜑 → (𝐴 · (𝐵 · 𝐶)) = (𝐵 · (𝐴 · 𝐶)))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1364  wcel 2167  (class class class)co 5922  cc 7877   · cmul 7884
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-ext 2178  ax-mulcom 7980  ax-mulass 7982
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-rex 2481  df-v 2765  df-un 3161  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-br 4034  df-iota 5219  df-fv 5266  df-ov 5925
This theorem is referenced by:  mulreim  8631  divrecap  8715  remullem  11036  cvgratnnlemnexp  11689  cvgratnnlemmn  11690  tanval3ap  11879  sinadd  11901  dvdscmulr  11985  bezoutlemnewy  12163  dvdsmulgcd  12192  lcmgcdlem  12245  cncongr1  12271  prmdiv  12403  tangtx  15074  gausslemma2dlem6  15308  lgseisenlem2  15312  lgseisenlem4  15314  lgsquadlem1  15318  2sqlem4  15359
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