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Theorem int-mulcomd 44621
Description: MultiplicationCommutativity generator rule. (Contributed by Stanislas Polu, 7-Apr-2020.)
Hypotheses
Ref Expression
int-mulcomd.1 (𝜑𝐵 ∈ ℝ)
int-mulcomd.2 (𝜑𝐶 ∈ ℝ)
int-mulcomd.3 (𝜑𝐴 = 𝐵)
Assertion
Ref Expression
int-mulcomd (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))

Proof of Theorem int-mulcomd
StepHypRef Expression
1 int-mulcomd.1 . . . 4 (𝜑𝐵 ∈ ℝ)
21recnd 11171 . . 3 (𝜑𝐵 ∈ ℂ)
3 int-mulcomd.2 . . . 4 (𝜑𝐶 ∈ ℝ)
43recnd 11171 . . 3 (𝜑𝐶 ∈ ℂ)
52, 4mulcomd 11164 . 2 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐵))
6 int-mulcomd.3 . . . 4 (𝜑𝐴 = 𝐵)
76eqcomd 2746 . . 3 (𝜑𝐵 = 𝐴)
87oveq2d 7379 . 2 (𝜑 → (𝐶 · 𝐵) = (𝐶 · 𝐴))
95, 8eqtrd 2775 1 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1547  wcel 2119  (class class class)co 7363  cr 11035   · cmul 11041
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2712  ax-resscn 11093  ax-mulcom 11100
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-clab 2719  df-cleq 2732  df-clel 2815  df-rab 3393  df-v 3434  df-dif 3893  df-un 3895  df-ss 3907  df-nul 4269  df-if 4462  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4846  df-br 5080  df-iota 6448  df-fv 6500  df-ov 7366
This theorem is referenced by: (None)
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