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Theorem mul12d 8197
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 8174 . 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 5925  cc 7896   · cmul 7903
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 7999  ax-mulass 8001
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 3629  df-pr 3630  df-op 3632  df-uni 3841  df-br 4035  df-iota 5220  df-fv 5267  df-ov 5928
This theorem is referenced by:  mulreim  8650  divrecap  8734  remullem  11055  cvgratnnlemnexp  11708  cvgratnnlemmn  11709  tanval3ap  11898  sinadd  11920  dvdscmulr  12004  bezoutlemnewy  12190  dvdsmulgcd  12219  lcmgcdlem  12272  cncongr1  12298  prmdiv  12430  tangtx  15160  gausslemma2dlem6  15394  lgseisenlem2  15398  lgseisenlem4  15400  lgsquadlem1  15404  2sqlem4  15445
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