Theorem mulcomli 8050

Description: Commutative law for multiplication. (Contributed by NM, 23-Nov-1994.)

Hypotheses

Ref	Expression
axi.1	⊢ 𝐴 ∈ ℂ
axi.2	⊢ 𝐵 ∈ ℂ
mulcomli.3	⊢ (𝐴 · 𝐵) = 𝐶

Assertion

Ref	Expression
mulcomli	⊢ (𝐵 · 𝐴) = 𝐶

Proof of Theorem mulcomli

Step	Hyp	Ref	Expression
1		axi.2	. . 3 ⊢ 𝐵 ∈ ℂ
2		axi.1	. . 3 ⊢ 𝐴 ∈ ℂ
3	1, 2	mulcomi 8049	. 2 ⊢ (𝐵 · 𝐴) = (𝐴 · 𝐵)
4		mulcomli.3	. 2 ⊢ (𝐴 · 𝐵) = 𝐶
5	3, 4	eqtri 2217	1 ⊢ (𝐵 · 𝐴) = 𝐶

Syntax hints:   = wceq 1364   ∈ wcel 2167  (class class class)co 5925  ℂcc 7894   · cmul 7901

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-5 1461  ax-gen 1463  ax-4 1524  ax-17 1540  ax-ext 2178  ax-mulcom 7997

This theorem depends on definitions:  df-bi 117  df-cleq 2189

This theorem is referenced by:  nummul2c  9523  halfthird  9616  5recm6rec  9617  sq4e2t8  10746  cos2bnd  11942  dec5nprm  12608  karatsuba  12624  2exp6  12627  2exp8  12629  2exp11  12630  2exp16  12631  2lgslem3a  15418  2lgsoddprmlem3c  15434  2lgsoddprmlem3d  15435  ex-exp  15457  ex-fac  15458