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Theorem int-mulcomd 44188
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 11132 . . 3 (𝜑𝐵 ∈ ℂ)
3 int-mulcomd.2 . . . 4 (𝜑𝐶 ∈ ℝ)
43recnd 11132 . . 3 (𝜑𝐶 ∈ ℂ)
52, 4mulcomd 11125 . 2 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐵))
6 int-mulcomd.3 . . . 4 (𝜑𝐴 = 𝐵)
76eqcomd 2736 . . 3 (𝜑𝐵 = 𝐴)
87oveq2d 7357 . 2 (𝜑 → (𝐶 · 𝐵) = (𝐶 · 𝐴))
95, 8eqtrd 2765 1 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1541  wcel 2110  (class class class)co 7341  cr 10997   · cmul 11003
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2112  ax-9 2120  ax-ext 2702  ax-resscn 11055  ax-mulcom 11062
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2067  df-clab 2709  df-cleq 2722  df-clel 2804  df-rab 3394  df-v 3436  df-dif 3903  df-un 3905  df-ss 3917  df-nul 4282  df-if 4474  df-sn 4575  df-pr 4577  df-op 4581  df-uni 4858  df-br 5090  df-iota 6433  df-fv 6485  df-ov 7344
This theorem is referenced by: (None)
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