Theorem axmulcom 9730

Description: Multiplication of complex numbers is commutative. Axiom 8 of 22 for real and complex numbers, derived from ZF set theory. This construction-dependent theorem should not be referenced directly, nor should the proven axiom ax-mulcom 9754 be used later. Instead, use mulcom 9776. (Contributed by NM, 31-Aug-1995.) (New usage is discouraged.)

Assertion

Ref	Expression
axmulcom	⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 · 𝐵) = (𝐵 · 𝐴))

Proof of Theorem axmulcom

Dummy variables 𝑥 𝑦 𝑧 𝑤 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		dfcnqs 9717	. 2 ⊢ ℂ = ((R × R) / ◡ E )
2		mulcnsrec 9719	. 2 ⊢ (((𝑥 ∈ R ∧ 𝑦 ∈ R) ∧ (𝑧 ∈ R ∧ 𝑤 ∈ R)) → ([⟨𝑥, 𝑦⟩]◡ E · [⟨𝑧, 𝑤⟩]◡ E ) = [⟨((𝑥 ·R 𝑧) +R (-1R ·R (𝑦 ·R 𝑤))), ((𝑦 ·R 𝑧) +R (𝑥 ·R 𝑤))⟩]◡ E )
3		mulcnsrec 9719	. 2 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑥 ∈ R ∧ 𝑦 ∈ R)) → ([⟨𝑧, 𝑤⟩]◡ E · [⟨𝑥, 𝑦⟩]◡ E ) = [⟨((𝑧 ·R 𝑥) +R (-1R ·R (𝑤 ·R 𝑦))), ((𝑤 ·R 𝑥) +R (𝑧 ·R 𝑦))⟩]◡ E )
4		mulcomsr 9664	. . 3 ⊢ (𝑥 ·R 𝑧) = (𝑧 ·R 𝑥)
5		mulcomsr 9664	. . . 4 ⊢ (𝑦 ·R 𝑤) = (𝑤 ·R 𝑦)
6	5	oveq2i 6436	. . 3 ⊢ (-1R ·R (𝑦 ·R 𝑤)) = (-1R ·R (𝑤 ·R 𝑦))
7	4, 6	oveq12i 6437	. 2 ⊢ ((𝑥 ·R 𝑧) +R (-1R ·R (𝑦 ·R 𝑤))) = ((𝑧 ·R 𝑥) +R (-1R ·R (𝑤 ·R 𝑦)))
8		mulcomsr 9664	. . . 4 ⊢ (𝑦 ·R 𝑧) = (𝑧 ·R 𝑦)
9		mulcomsr 9664	. . . 4 ⊢ (𝑥 ·R 𝑤) = (𝑤 ·R 𝑥)
10	8, 9	oveq12i 6437	. . 3 ⊢ ((𝑦 ·R 𝑧) +R (𝑥 ·R 𝑤)) = ((𝑧 ·R 𝑦) +R (𝑤 ·R 𝑥))
11		addcomsr 9662	. . 3 ⊢ ((𝑧 ·R 𝑦) +R (𝑤 ·R 𝑥)) = ((𝑤 ·R 𝑥) +R (𝑧 ·R 𝑦))
12	10, 11	eqtri 2536	. 2 ⊢ ((𝑦 ·R 𝑧) +R (𝑥 ·R 𝑤)) = ((𝑤 ·R 𝑥) +R (𝑧 ·R 𝑦))
13	1, 2, 3, 7, 12	ecovcom 7616	1 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 · 𝐵) = (𝐵 · 𝐴))

Syntax hints:   → wi 4   ∧ wa 382   = wceq 1474   ∈ wcel 1938   E cep 4841  ^◡ccnv 4931  (class class class)co 6425  Rcnr 9441  -1_Rcm1r 9444   +_R cplr 9445   ·_R cmr 9446  ℂcc 9688   · cmul 9695

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1700  ax-4 1713  ax-5 1793  ax-6 1838  ax-7 1885  ax-8 1940  ax-9 1947  ax-10 1966  ax-11 1971  ax-12 1983  ax-13 2137  ax-ext 2494  ax-sep 4607  ax-nul 4616  ax-pow 4668  ax-pr 4732  ax-un 6722  ax-inf2 8296

This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1699  df-sb 1831  df-eu 2366  df-mo 2367  df-clab 2501  df-cleq 2507  df-clel 2510  df-nfc 2644  df-ne 2686  df-ral 2805  df-rex 2806  df-reu 2807  df-rmo 2808  df-rab 2809  df-v 3079  df-sbc 3307  df-csb 3404  df-dif 3447  df-un 3449  df-in 3451  df-ss 3458  df-pss 3460  df-nul 3778  df-if 3940  df-pw 4013  df-sn 4029  df-pr 4031  df-tp 4033  df-op 4035  df-uni 4271  df-int 4309  df-iun 4355  df-br 4482  df-opab 4542  df-mpt 4543  df-tr 4579  df-eprel 4843  df-id 4847  df-po 4853  df-so 4854  df-fr 4891  df-we 4893  df-xp 4938  df-rel 4939  df-cnv 4940  df-co 4941  df-dm 4942  df-rn 4943  df-res 4944  df-ima 4945  df-pred 5487  df-ord 5533  df-on 5534  df-lim 5535  df-suc 5536  df-iota 5653  df-fun 5691  df-fn 5692  df-f 5693  df-f1 5694  df-fo 5695  df-f1o 5696  df-fv 5697  df-ov 6428  df-oprab 6429  df-mpt2 6430  df-om 6833  df-1st 6933  df-2nd 6934  df-wrecs 7168  df-recs 7230  df-rdg 7268  df-1o 7322  df-oadd 7326  df-omul 7327  df-er 7504  df-ec 7506  df-qs 7510  df-ni 9448  df-pli 9449  df-mi 9450  df-lti 9451  df-plpq 9484  df-mpq 9485  df-ltpq 9486  df-enq 9487  df-nq 9488  df-erq 9489  df-plq 9490  df-mq 9491  df-1nq 9492  df-rq 9493  df-ltnq 9494  df-np 9557  df-plp 9559  df-mp 9560  df-ltp 9561  df-enr 9631  df-nr 9632  df-plr 9633  df-mr 9634  df-c 9696  df-mul 9702

This theorem is referenced by: (None)