Theorem int-mulcomd 43501

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

Step	Hyp	Ref	Expression
1		int-mulcomd.1	. . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ)
2	1	recnd 11246	. . 3 ⊢ (𝜑 → 𝐵 ∈ ℂ)
3		int-mulcomd.2	. . . 4 ⊢ (𝜑 → 𝐶 ∈ ℝ)
4	3	recnd 11246	. . 3 ⊢ (𝜑 → 𝐶 ∈ ℂ)
5	2, 4	mulcomd 11239	. 2 ⊢ (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐵))
6		int-mulcomd.3	. . . 4 ⊢ (𝜑 → 𝐴 = 𝐵)
7	6	eqcomd 2732	. . 3 ⊢ (𝜑 → 𝐵 = 𝐴)
8	7	oveq2d 7421	. 2 ⊢ (𝜑 → (𝐶 · 𝐵) = (𝐶 · 𝐴))
9	5, 8	eqtrd 2766	1 ⊢ (𝜑 → (𝐵 · 𝐶) = (𝐶 · 𝐴))

Syntax hints:   → wi 4   = wceq 1533   ∈ wcel 2098  (class class class)co 7405  ℝcr 11111   · cmul 11117

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2697  ax-resscn 11169  ax-mulcom 11176

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 845  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-clab 2704  df-cleq 2718  df-clel 2804  df-rab 3427  df-v 3470  df-dif 3946  df-un 3948  df-in 3950  df-ss 3960  df-nul 4318  df-if 4524  df-sn 4624  df-pr 4626  df-op 4630  df-uni 4903  df-br 5142  df-iota 6489  df-fv 6545  df-ov 7408

This theorem is referenced by: (None)