Theorem axmulf 11106

Description: Multiplication is an operation on the complex numbers. This is the construction-dependent version of ax-mulf 11155 and it should not be referenced outside the construction. We generally prefer to develop our theory using the less specific mulcl 11159. (Contributed by NM, 8-Feb-2005.) (New usage is discouraged.)

Assertion

Ref	Expression
axmulf	⊢ · :(ℂ × ℂ)⟶ℂ

Proof of Theorem axmulf

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

Step	Hyp	Ref	Expression
1		moeq 3681	. . . . . . . . 9 ⊢ ∃*𝑧 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩
2	1	mosubop 5474	. . . . . . . 8 ⊢ ∃*𝑧∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)
3	2	mosubop 5474	. . . . . . 7 ⊢ ∃*𝑧∃𝑤∃𝑣(𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))
4		anass 468	. . . . . . . . . . 11 ⊢ (((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ (𝑥 = ⟨𝑤, 𝑣⟩ ∧ (𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
5	4	2exbii 1849	. . . . . . . . . 10 ⊢ (∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ ∃𝑢∃𝑓(𝑥 = ⟨𝑤, 𝑣⟩ ∧ (𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
6		19.42vv 1957	. . . . . . . . . 10 ⊢ (∃𝑢∃𝑓(𝑥 = ⟨𝑤, 𝑣⟩ ∧ (𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)) ↔ (𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
7	5, 6	bitri 275	. . . . . . . . 9 ⊢ (∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ (𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
8	7	2exbii 1849	. . . . . . . 8 ⊢ (∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ ∃𝑤∃𝑣(𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
9	8	mobii 2542	. . . . . . 7 ⊢ (∃*𝑧∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩) ↔ ∃*𝑧∃𝑤∃𝑣(𝑥 = ⟨𝑤, 𝑣⟩ ∧ ∃𝑢∃𝑓(𝑦 = ⟨𝑢, 𝑓⟩ ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)))
10	3, 9	mpbir 231	. . . . . 6 ⊢ ∃*𝑧∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩)
11	10	moani 2547	. . . . 5 ⊢ ∃*𝑧((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))
12	11	funoprab 7514	. . . 4 ⊢ Fun {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))}
13		df-mul 11087	. . . . 5 ⊢ · = {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))}
14	13	funeqi 6540	. . . 4 ⊢ (Fun · ↔ Fun {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))})
15	12, 14	mpbir 231	. . 3 ⊢ Fun ·
16	13	dmeqi 5871	. . . . 5 ⊢ dom · = dom {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))}
17		dmoprabss 7496	. . . . 5 ⊢ dom {⟨⟨𝑥, 𝑦⟩, 𝑧⟩ ∣ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) ∧ ∃𝑤∃𝑣∃𝑢∃𝑓((𝑥 = ⟨𝑤, 𝑣⟩ ∧ 𝑦 = ⟨𝑢, 𝑓⟩) ∧ 𝑧 = ⟨((𝑤 ·R 𝑢) +R (-1R ·R (𝑣 ·R 𝑓))), ((𝑣 ·R 𝑢) +R (𝑤 ·R 𝑓))⟩))} ⊆ (ℂ × ℂ)
18	16, 17	eqsstri 3996	. . . 4 ⊢ dom · ⊆ (ℂ × ℂ)
19		0ncn 11093	. . . . 5 ⊢ ¬ ∅ ∈ ℂ
20		df-c 11081	. . . . . . 7 ⊢ ℂ = (R × R)
21		oveq1 7397	. . . . . . . 8 ⊢ (⟨𝑧, 𝑤⟩ = 𝑥 → (⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) = (𝑥 · ⟨𝑣, 𝑢⟩))
22	21	eleq1d 2814	. . . . . . 7 ⊢ (⟨𝑧, 𝑤⟩ = 𝑥 → ((⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) ∈ (R × R) ↔ (𝑥 · ⟨𝑣, 𝑢⟩) ∈ (R × R)))
23		oveq2 7398	. . . . . . . 8 ⊢ (⟨𝑣, 𝑢⟩ = 𝑦 → (𝑥 · ⟨𝑣, 𝑢⟩) = (𝑥 · 𝑦))
24	23	eleq1d 2814	. . . . . . 7 ⊢ (⟨𝑣, 𝑢⟩ = 𝑦 → ((𝑥 · ⟨𝑣, 𝑢⟩) ∈ (R × R) ↔ (𝑥 · 𝑦) ∈ (R × R)))
25		mulcnsr 11096	. . . . . . . 8 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → (⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) = ⟨((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))), ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢))⟩)
26		mulclsr 11044	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ R ∧ 𝑣 ∈ R) → (𝑧 ·R 𝑣) ∈ R)
27		m1r 11042	. . . . . . . . . . . 12 ⊢ -1R ∈ R
28		mulclsr 11044	. . . . . . . . . . . 12 ⊢ ((𝑤 ∈ R ∧ 𝑢 ∈ R) → (𝑤 ·R 𝑢) ∈ R)
29		mulclsr 11044	. . . . . . . . . . . 12 ⊢ ((-1R ∈ R ∧ (𝑤 ·R 𝑢) ∈ R) → (-1R ·R (𝑤 ·R 𝑢)) ∈ R)
30	27, 28, 29	sylancr 587	. . . . . . . . . . 11 ⊢ ((𝑤 ∈ R ∧ 𝑢 ∈ R) → (-1R ·R (𝑤 ·R 𝑢)) ∈ R)
31		addclsr 11043	. . . . . . . . . . 11 ⊢ (((𝑧 ·R 𝑣) ∈ R ∧ (-1R ·R (𝑤 ·R 𝑢)) ∈ R) → ((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))) ∈ R)
32	26, 30, 31	syl2an 596	. . . . . . . . . 10 ⊢ (((𝑧 ∈ R ∧ 𝑣 ∈ R) ∧ (𝑤 ∈ R ∧ 𝑢 ∈ R)) → ((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))) ∈ R)
33	32	an4s 660	. . . . . . . . 9 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → ((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))) ∈ R)
34		mulclsr 11044	. . . . . . . . . . 11 ⊢ ((𝑤 ∈ R ∧ 𝑣 ∈ R) → (𝑤 ·R 𝑣) ∈ R)
35		mulclsr 11044	. . . . . . . . . . 11 ⊢ ((𝑧 ∈ R ∧ 𝑢 ∈ R) → (𝑧 ·R 𝑢) ∈ R)
36		addclsr 11043	. . . . . . . . . . 11 ⊢ (((𝑤 ·R 𝑣) ∈ R ∧ (𝑧 ·R 𝑢) ∈ R) → ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢)) ∈ R)
37	34, 35, 36	syl2anr 597	. . . . . . . . . 10 ⊢ (((𝑧 ∈ R ∧ 𝑢 ∈ R) ∧ (𝑤 ∈ R ∧ 𝑣 ∈ R)) → ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢)) ∈ R)
38	37	an42s 661	. . . . . . . . 9 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢)) ∈ R)
39	33, 38	opelxpd 5680	. . . . . . . 8 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → ⟨((𝑧 ·R 𝑣) +R (-1R ·R (𝑤 ·R 𝑢))), ((𝑤 ·R 𝑣) +R (𝑧 ·R 𝑢))⟩ ∈ (R × R))
40	25, 39	eqeltrd 2829	. . . . . . 7 ⊢ (((𝑧 ∈ R ∧ 𝑤 ∈ R) ∧ (𝑣 ∈ R ∧ 𝑢 ∈ R)) → (⟨𝑧, 𝑤⟩ · ⟨𝑣, 𝑢⟩) ∈ (R × R))
41	20, 22, 24, 40	2optocl 5737	. . . . . 6 ⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (𝑥 · 𝑦) ∈ (R × R))
42	41, 20	eleqtrrdi 2840	. . . . 5 ⊢ ((𝑥 ∈ ℂ ∧ 𝑦 ∈ ℂ) → (𝑥 · 𝑦) ∈ ℂ)
43	19, 42	oprssdm 7573	. . . 4 ⊢ (ℂ × ℂ) ⊆ dom ·
44	18, 43	eqssi 3966	. . 3 ⊢ dom · = (ℂ × ℂ)
45		df-fn 6517	. . 3 ⊢ ( · Fn (ℂ × ℂ) ↔ (Fun · ∧ dom · = (ℂ × ℂ)))
46	15, 44, 45	mpbir2an 711	. 2 ⊢ · Fn (ℂ × ℂ)
47	42	rgen2 3178	. 2 ⊢ ∀𝑥 ∈ ℂ ∀𝑦 ∈ ℂ (𝑥 · 𝑦) ∈ ℂ
48		ffnov 7518	. 2 ⊢ ( · :(ℂ × ℂ)⟶ℂ ↔ ( · Fn (ℂ × ℂ) ∧ ∀𝑥 ∈ ℂ ∀𝑦 ∈ ℂ (𝑥 · 𝑦) ∈ ℂ))
49	46, 47, 48	mpbir2an 711	1 ⊢ · :(ℂ × ℂ)⟶ℂ

Syntax hints:   ∧ wa 395   = wceq 1540  ∃wex 1779   ∈ wcel 2109  ∃*wmo 2532  ∀wral 3045  ⟨cop 4598   × cxp 5639  dom cdm 5641  Fun wfun 6508   Fn wfn 6509  ⟶wf 6510  (class class class)co 7390  {coprab 7391  Rcnr 10825  -1_Rcm1r 10828   +_R cplr 10829   ·_R cmr 10830  ℂcc 11073   · cmul 11080

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2702  ax-sep 5254  ax-nul 5264  ax-pow 5323  ax-pr 5390  ax-un 7714  ax-inf2 9601

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2534  df-eu 2563  df-clab 2709  df-cleq 2722  df-clel 2804  df-nfc 2879  df-ne 2927  df-ral 3046  df-rex 3055  df-rmo 3356  df-reu 3357  df-rab 3409  df-v 3452  df-sbc 3757  df-csb 3866  df-dif 3920  df-un 3922  df-in 3924  df-ss 3934  df-pss 3937  df-nul 4300  df-if 4492  df-pw 4568  df-sn 4593  df-pr 4595  df-op 4599  df-uni 4875  df-int 4914  df-iun 4960  df-br 5111  df-opab 5173  df-mpt 5192  df-tr 5218  df-id 5536  df-eprel 5541  df-po 5549  df-so 5550  df-fr 5594  df-we 5596  df-xp 5647  df-rel 5648  df-cnv 5649  df-co 5650  df-dm 5651  df-rn 5652  df-res 5653  df-ima 5654  df-pred 6277  df-ord 6338  df-on 6339  df-lim 6340  df-suc 6341  df-iota 6467  df-fun 6516  df-fn 6517  df-f 6518  df-f1 6519  df-fo 6520  df-f1o 6521  df-fv 6522  df-ov 7393  df-oprab 7394  df-mpo 7395  df-om 7846  df-1st 7971  df-2nd 7972  df-frecs 8263  df-wrecs 8294  df-recs 8343  df-rdg 8381  df-1o 8437  df-oadd 8441  df-omul 8442  df-er 8674  df-ec 8676  df-qs 8680  df-ni 10832  df-pli 10833  df-mi 10834  df-lti 10835  df-plpq 10868  df-mpq 10869  df-ltpq 10870  df-enq 10871  df-nq 10872  df-erq 10873  df-plq 10874  df-mq 10875  df-1nq 10876  df-rq 10877  df-ltnq 10878  df-np 10941  df-1p 10942  df-plp 10943  df-mp 10944  df-ltp 10945  df-enr 11015  df-nr 11016  df-plr 11017  df-mr 11018  df-m1r 11022  df-c 11081  df-mul 11087

This theorem is referenced by:  axmulcl  11113