Users' Mathboxes Mathbox for Stanislas Polu < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  int-mulcomd Structured version   Visualization version   GIF version

Theorem int-mulcomd 44151
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 11271 . . 3 (𝜑𝐵 ∈ ℂ)
3 int-mulcomd.2 . . . 4 (𝜑𝐶 ∈ ℝ)
43recnd 11271 . . 3 (𝜑𝐶 ∈ ℂ)
52, 4mulcomd 11264 . 2 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐵))
6 int-mulcomd.3 . . . 4 (𝜑𝐴 = 𝐵)
76eqcomd 2740 . . 3 (𝜑𝐵 = 𝐴)
87oveq2d 7429 . 2 (𝜑 → (𝐶 · 𝐵) = (𝐶 · 𝐴))
95, 8eqtrd 2769 1 (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1539  wcel 2107  (class class class)co 7413  cr 11136   · cmul 11142
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2706  ax-resscn 11194  ax-mulcom 11201
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2713  df-cleq 2726  df-clel 2808  df-rab 3420  df-v 3465  df-dif 3934  df-un 3936  df-ss 3948  df-nul 4314  df-if 4506  df-sn 4607  df-pr 4609  df-op 4613  df-uni 4888  df-br 5124  df-iota 6494  df-fv 6549  df-ov 7416
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator