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Theorem int-mulcomd 45270
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 11341 . . 3 (𝜑 → 𝐵 ∈ ℂ)
3 int-mulcomd.2 . . . 4 (𝜑 → 𝐶 ∈ ℝ)
43recnd 11341 . . 3 (𝜑 → 𝐶 ∈ ℂ)
52, 4mulcomd 11334 . 2 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐵))
6 int-mulcomd.3 . . . 4 (𝜑 → 𝐴 = 𝐵)
76eqcomd 2766 . . 3 (𝜑 → 𝐵 = 𝐴)
87oveq2d 7437 . 2 (𝜑 → (𝐶 · 𝐵) = (𝐶 · 𝐴))
95, 8eqtrd 2795 1 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569   ∈ wcel 2144  (class class class)co 7421  ℝcr 11203   · cmul 11209
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-resscn 11261  ax-mulcom 11268
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-br 5103  df-iota 6494  df-fv 6547  df-ov 7424
This theorem is used by: (None)
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