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Theorem int-mulcomd 45431
Description: MultiplicationCommutativity generator rule. (Contributed by Stanislas Polu, 7-Apr-2020.)
Hypotheses
Ref Expression
int-mulcomd.1 (𝜑 → 𝐵 ∈ ℝ)
int-mulcomd.2 (𝜑 → 𝐶 ∈ ℝ)
int-mulcomd.3 (𝜑 → 𝐴 = 𝐵)
Assertion
Ref Expression
int-mulcomd (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))

Proof of Theorem int-mulcomd
StepHypRef Expression
1 int-mulcomd.1 . . . 4 (𝜑 → 𝐵 ∈ ℝ)
21recnd 11374 . . 3 (𝜑 → 𝐵 ∈ ℂ)
3 int-mulcomd.2 . . . 4 (𝜑 → 𝐶 ∈ ℝ)
43recnd 11374 . . 3 (𝜑 → 𝐶 ∈ ℂ)
52, 4mulcomd 11367 . 2 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐵))
6 int-mulcomd.3 . . . 4 (𝜑 → 𝐴 = 𝐵)
76eqcomd 2769 . . 3 (𝜑 → 𝐵 = 𝐴)
87oveq2d 7465 . 2 (𝜑 → (𝐶 · 𝐵) = (𝐶 · 𝐴))
95, 8eqtrd 2798 1 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570   ∈ wcel 2147  (class class class)co 7449  ℝcr 11236   · cmul 11242
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-ext 2735  ax-resscn 11294  ax-mulcom 11301
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2102  df-clab 2742  df-cleq 2755  df-clel 2839  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-iota 6518  df-fv 6572  df-ov 7452
This theorem is used by: (None)
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